Saturday 22 February 2014

Ecogeeks in Africa-Part 1


Almost a month ago, I returned from an incredible University trip to Kenya alongside other enthusiastic conservation students. The purpose was to explore the realities of conservation in a tropical country with spectacular wildlife. The journey of discovery took us not only to Kenya’s famous nature reserves, but also to the people striving to protect the ecosystems, indigenous communities who must deal with predators on their doorstep and the managers and users of the country’s precious water resources. We travelled across surprisingly diverse ecoregions on our trip, and these provide the framework for the following two articles, describing the wildlife and the key issues in each habitat.

1-Urban Kenya

Our trip began around Nairobi, Kenya’s capital. Despite the country’s 50-year independence it is still strikingly British, as all the signs are predominantly in English. However, the disorganised shanties would be a British health and safety inspector’s nightmare (In stark contrast to the grand, manicured government developments in Narok town). Wildlife thrives in the unkemptness of the shanties. Two large birds are common here, the Black Kite and the Sacred Ibis, both making a living by rummaging in rubbish for meat scraps. They are joined by the Pied Crow, an impressive raven in magpie’s clothing. Flocks of superb starling are a surprising dazzle of colour in the dusty towns, completely metallic and painted blue and green with an orange chest. Scattered acacia trees are festooned with the hanging baskets of weaverbird nests. The various species dressed in black and yellow are frustratingly difficult to tell apart. These urbanites are few, yet successful, especially as Nairobi continues to expand.

Kenyan urbanites. 1)Sacred ibis(Threskiornis aethiopicus), 2)Black kite(Milvus migrans),
3)Pied crow (Corvus albus), 4)African pied wagtail (Motacilla aguimp), 5)Speckled pigeon (Columba guinea), 6)Superb starling(Lamprotornis superbus), 7)Village weaver(Ploceus cucullatus),
8)Vitelline masked weaver(Ploceus vitellinus) , 9)Browed sparrow-weaver(Plocepasser mahali).

2- Savannahs

The Savannah is the habitat most people associate with Kenya. The vast grasslands are home to the World’s largest and most famous land mammals. Tourism has habituated the wildlife to vehicles, but there is still a world of difference to seeing them in a zoo. Although we visited during the dry season, high rainfall in recent years has made the savannas much greener and more verdant with wildflowers than the yellowing grass landscape we were expecting. The trip wouldn’t be complete without safaris, and our duty to collect data from our observations made them slightly more productive than the typical tourist experience.

Our first stop was Nairobi National Park. Though relatively small it was packed with spectacular wildlife, including a family of White Rhino and our first views of stately Maasai Giraffes. If you were prepared to ignore the tower blocks on the horizon and the occasional plastic bag in the bushes it was a tropical paradise!

The bizarre contrast in Nairobi National Park, where the city has grown to meet the wilderness.
Photo by author.


















At Olerai conservancy we had a walking Safari, giving us the opportunity to see the Savannahs hidden treasures. There were delicate wildflowers in a variety of shapes and colours, along with spectacular invertebrates, including large tunnelling wolf spiders and their predators, huge spider-hunting wasps with black bodies and iridescent wings. More about Conservancies later.



A selection of wildflowers growing in Olerai Conservancy.Photographs by author.

At Hell’s Gate National Park, we were able to walk amongst game animals. The park is in Kenya’s portion of the Great Rift Valley. It is deemed safe to walk through due to a lack of big cats, but we found several signs of cheetah and a leopard was seen last year. Though our objective was to collect data on the game animals we saw, we couldn’t help being distracted by the amazing geological landscape. It is also home to a major roost of endangered Ruppell’s griffon vultures.


Zebra watching at Hell's Gate National Park. Photo by author.

 The grand finale was the Maasai Mara Game Reserve where we had the complete African wildlife experience including elephants, lounging cheetahs and a 20+ strong herd of giraffe (known as a tower). The jewel in the crown was finding lions feeding on an old buffalo carcass surrounded by a full cast of scavengers including jackals snatching bites under the lion’s nose, a mixed flock of vultures and spotted hyenas waiting in the wings.
Hyenas provided some memorable moments in the Mara. Firstly when a safari bus had a blow-out and a hyena approached to check its chances of a tourist takeaway and the next day when another chased a gazelle fawn straight across the road in front of us.  Our wild camping experience in a neighbouring conservancy was put into perspective when we encountered a pack of five on a drive a few hundred meters away.

Welcome to the Mara! Lion, white-backed vulture and black-backed jackal at the buffalo carcass, watched by buses and balloons. Photograph ©Joshua Baum. Used with permission.

  Overall, the bus group I was part of was the only one to see the Big Five (Lion, Leopard, Buffalo, Black Rhino and Elephant) thanks to a brilliant spot of a leopard in the grass at Nakuru National Park. Asides from the spectacular megafauna, the group also saw some of the smaller, more elusive mammals, some on a night drive around one of our camps. Dikdiks, groups of banded mongoose, hares and a genet slinking along (An attractive carnivore like a graceful cross between a cat and a mongoose). One group even saw a serval walking close by.


Not forgetting the primates. Troops of shifty-looking olive Baboons scattered around the Savannahs and in our camps kept us entertained with their family activities and quickly took advantage of dropped food.  The more graceful black-faced vervet monkeys in the wooded areas were still not averse to raiding car park bins, whilst the handsome black and white colobus were content picking leaves from the trees, where they were agile leapers despite their bulk. Fisherman’s camp was famous for its nocturnal bushbabies, located by their torch lit eyeshine, though I did not see any myself.
Savannah monkeys.Black and white colobus (Left), Black-faced vervet (Above), Olive baboon(Below).
Photos by author.

The sheer number and diversity of birds of prey on the savannahs showed that the smaller wildlife must be doing well too. The most common was the Augur Buzzard, smartly black and white with a red tail, and we were also lucky to see pallid harriers coasting over the grass, several eagles, hawks, falcons and the distinctive ground-hunting secretary bird, one of which put on a spectacular flying display for us. Other memorable birds included ostrich, the technicolor lilac-breasted roller, and the long-tailed widowbird, a species where the male’s tail has evolved so long to attract a mate that he has difficulty flying!

Coming away from the Nature Reserves into the pastoral areas inhabited by the Maasai was quite a contrast. It was odd to see zebra, gazelle and wildebeest living alongside the herds of livestock, but the short grazed grass offered nowhere for smaller animals to hide. Many ground birds seemed to enjoy this though, with several Lapwing species, handsome crowned cranes, sandgrouse and the 1.2 meter-tall Kori bustard taking advantage of the easy foraging for insects and seeds.



A family of plains zebra against a backdrop of sheep and farm buildings in Maasai pastoral land.
 Photo by author.
We visited these lands to talk to three Maasai clans. Livestock herding or pastoralism is integral to their culture. Appreciation of Wildlife is another of their core values, but their attitudes to different animals vary. Unsurprisingly, large carnivores are not so loved. One tribe told us how lions take around 200 cattle a year, something the Government used to compensate for until some decided to cheat the system and blame natural deaths on lions. Despite being illegal, retaliatory killing is still practiced, though other measures such as flashing lights or fortifying the livestock pens are more effective and promising methods.

Encouragingly, two of the Maasai clans we visited had set up conservancies. These are nature reserves run by the Maasai themselves rather than the Kenya Wildlife Service government department. Olerai conservancy was recently set up as a legacy to prevent division of the clan’s land into private plots. We were fortunate enough to talk with two of the clan members, helping them understand what tourists would want from the area. We experienced wild camping in the Maasai Mara Conservancy , which was thriving with wildlife freely moving from the game reserve. The conservancies are an encouraging solution to a recent conservation issue. The loss of many clans’ traditional nomadic culture in favour of securing land rights since the 1960’s has led to greater impacts on the land.  Setting their land aside to generate a sustainable income from nature tourism gives wildlife not only more space, but more value and greater protection.


Morning in the Maasai Mara Conservancy camp. Photo by author.


The Maasai are not the only people to set up their own reserves. Our trip also included a visit to Solio Ranch, a private, fenced area set up for breeding black and white rhinos for stocking nature reserves. With 188 rhino, the ranch has the highest density of both species in one place. It was astounding to see them gathered in herds, apparently a more natural situation than the widely scattered individuals in most parks as a tragic artefact of poaching. This private rhino ‘farm’ sparked much debate on the issue of private versus public reserves for conservation. The owners face a new legal hurdle, as the influential 2013 Wildlife Conservation Management Bill prevents them from selling black rhino, greatly reducing the reserve’s income. However, this may be a small price to pay, since the bill imposes suitably serious penalties on poaching the Big 5. Sadly even Solio is not immune to poachers, and two have recently been caught on the reserve.


The take-home shot from Solio Ranch. Black rhino herd  against Mount Kenya. Photo by author.

And so went our journey across the Kenyan Savannahs. This article covers just some of the revealing experiences we had. In Part 2, I will cover our journey of Kenya’s wetlands and highlands. In the meantime, get acquainted with some of the fantastic savannah wildlife we saw in the true Ecogeek style below.




1.      1.       African long-crested eagle (Lophaetus occipitalis)-The males have the longest headcrest. Their main prey is small rodents, but they will also take other small animals and even fruit.

2.       Long-tailed fiscal (Lanius cabanisi)-A species of shrike common almost everywhere in Kenya, perched conspicuously in the open where they watch for insects on the ground.
3.       Long-tailed widowbird (Euplectes progne)-With his ridiculously long-tail to attract a mate, this species is a textbook example of the powers of sexual selection. Males closest to the physical limit for tail size are considered most attractive by the females.
4.       Yellow-throated sandgrouse (Pterocles gutturalis)- Relatives of pigeons, sand grouse are superbly adapted to arid conditions. They nest in the dry season and the adults have absorbent breast feathers to carry water from pools to their chicks.
5.       Dung beetles-  Bury the dung and lay their eggs on it to feed their offspring. Whilst burrowers simply tunnel under the dung , rollers form balls which they take away to be buried, reducing competition.
6.       Waste paper plant- Grows in heavily grazed areas where it is a parasite on the roots of grasses. Named for the resemblance of the scattered, flimsy flowers to scraps of tissue paper.
7.       Colotis butterfly-Various red, orange and yellow colitis sp are the most common butterflies of the savannah. They seem to have boundless energy as they fly almost non-stop  in random directions.
8.       Kori bustard (Ardeotis kori)- At an impressive 18 kg and 1.2m long, this is the World’s heaviest flying bird. They usually stay on the ground, where they hunt large insects, lizards and snakes.
9.       Cape Buffalo (Syncerus caffer)- Renowned as one of Africa’s most dangerous animals, even standing up to lions. Buffalo feature on the ‘Big 5’ as large, unpredictable lone bulls were prized hunting trophies.
10.    Candelabra tree(Euphorbia ingens)- This giant euphorbia is able to grow up to 10 meters tall. It remains uneaten thanks to its spines and sticky sap which causes blisters.
11.    Mould beetle-Soil sticks to static hairs on this beetle’s body, helping it camouflage as it forages on open ground.
12.    Crowned lapwing (Vanellus coronatus) -Common across Savannahs and pastures in short grass where it feeds mainly on termites.
13.    Prickly pear-Though the spines make it unpalatable to animals, this cactus has two human food uses, it’s edible fruit and the red food dye coccineal derived from the aphids which feed on it.
14.    Thomson’s gazelle (Eudorcas thomsonii)- The commonest antelope in East Africa, ‘Tommie’s’ make up for their small stature  with speed, reaching 80kmph.
15.    Plains zebra (Equus burchelli)- Zebras stripes help create an optical illusion when they move, confusing  both predators and biting insects.
16.    African hare (Lepus microtis)-Like most hares, rely on their speed to escape predators in open habitat. They can leap up to 10 feet.
17.    Aloe- The succulent leaves of aloes conserve water. They famously soothe irritated skin, and are sought by elephants as a hydrating snack.
18.    Trap-jaw ant (Odontomachus sp.)-The jaws of these ants are so fast and powerful they can be used to propel themselves into the air from a hard surface, but are more usually used to snatch fast-moving insects.
19.    Mwanza flat-headed rock agama (Agama Mwanzae)-The male’s spectacular colouring gets  brighter with dominance and has leant them the nickname ‘Spider man agama’.
20.    White-bellied bustard (Eupodotis senegalensis)-Far smaller than kori’s bustard. The male puffs out a black beard during display.
21.     Common Eland (Taurotragus oryx)-This cow-like antelope is the second largest in the world after the giant eland. Bulls develop a large dewlap with age.
22.    Temminck's Courser (Cursorius temminckii)- Strangely for a wader, coarsers prefer arid areas and are good runners.
23.    Cheetah (Acinonyx jubatus) - The world’s fastest land mammal in order to catch gazelle, these slender cats often hunt in the midday heat to avoid more powerful predators stealing their kills.
24.    Common Warthog (Phacochoerus africanus) The ‘warts’ on the side of the head act as fat reserves and protect the male’s face from their opponents tusks during fights.
25.    Red-billed oxpecker (Buphagus erythrorhynchus)- Long thought to be helpful to large herbivores by picking off ticks, oxpeckers actually have a taste for blood. They wait until ticks are engorged before eating them and will keep wounds open to feed from them.
26.    Pallid Harrier (Circus macrourus) – Migrate to Africa from Eastern Europe and West Asia in winter. Like other harriers, they coast along low to the grass, watching and listening for birds and small mammals.
27.    Common Ostrich (Struthio camelus)-The World’s largest modern bird.Males are the main carers of the offspring.
28.    Topi  (Damaliscus korrigum) - In the breeding season, males gether into leks where both sexes compete for mates.
29.    Secretary bird (Sagittarius serpentarius) - Named after  their head feathers resembling old secretaries with quills behind their ears, these raptors wade through the grass using their long legs and feet to subdue snakes and other small animals.
30.    Blue Wildebeest (Connochaetes taurinus)-Following the fresh grass growth with the rains, Kenyan Wildebeest migrate to Tanzania and back. In recent years their migration patterns have changed , possibly due to climate change.
31.    Pompillid- This huge wasp (4cm), paralyses burrowing wolf spiders and buries them alive to feed her larvae.
32.    Pentanisia (Pentanisia. prunelloides)- The delicate pastel-blue flowers attract butterflies, whilst  the root is used medicinally by native tribes to treat burning-anything from burned skin to fever and heartburn (though it is not scientifically proven to work).
33.    Banded mongoose (Mungos mungo) - A colonial  mongoose . Amazingly, all females in a group give birth within a few days of each other, so the group can care for the young in a crèche.
34.    Burrowing wolf spider(Geolycosa sp.)- One of Africa’s largest spiders. Unlike most wolf spiders which are active hunters, the females ambush insects from their silk-lined burrows.
35.    Bur marigold (Bidens sp.)-These sunshine yellow flowers patchwork the savannah and are important nectar source for native honeybees.
36.    Yellow-necked spurfowl (Pternistis leucoscepus) -  Closely related to chickens. Both sexes have bare yellow necks and the males call at dawn from termite mounds.
37.    White rhinoceros(Ceratotherium simum) - A corruption of the Afrikaans "wijd", meaning "wide", after it’s broad lips used for grazing. White rhinos are not native to Kenya, but introduced as attractions in the Parks.
38.    Pangani longclaw(Macronyx aurantiigula) – One of the few easily-recognisable pipit-like birds on the plains owing to the male’s orange- yellow throat.
39.    Northern anteater chat (Myrmecocichla aethiops )-Presumably eats ants and/or termites, but very little information is available on this common bird.
40.    Helmeted guineafowl (Numida meleagris)-This distinctive and loud gamebird travels in groups, sweeping the grasslands for edible plants and small animals. They are thought to be major controllers of ticks.
41.    African elephant (Loxodonta africana)- The largest land animal, with an appetite for destroying trees to maintain open grassland, elephants must range great distances to sustain themselves.
42.    Umbrella thorn acacia (Vachellia tortilis)- The iconic tree of the savannah. The umbrella-thorn is able to dominate this habitat through being extremely tolerant of drought, high temperatures (up to 50° C) poor soils, alkalinity and even night frosts at higher elevations.
43.    Cattle egret (Bubulcus ibis)-Named for their habit of following large mammals to snap up the insects and small vertebrates which get disturbed.
44.    Spotted hyena (Crocutta crocutta)-Hyenas are much misunderstood. Though efficient scavengers, they mainly hunt their own prey. Despite appearances and behaviour they are also more closely related to cats and mongooses than to dogs.
45.    Black-backed Jackal (Canis mesomelas) –These small dogs hunt rodents, hares and small antelopes aswell as using their agility and cunning to scavenge kills from larger predators-often right under their noses!
46.    Impala (Aepyceros melampus)-Common in scrubby Savanna in herds of up to two hundred. Males are territorial in the breeding season, when they attempt to control a harem of visiting females.
47.    Thorn apple (Datura stramonium)-This plant is not grazed since it’s alkaloid content makes it deadly toxic, at just above the doses for medicinal use!
48.    African monarch (Danaus chrysippus)-This butterfly retains poisonous alkaloids from the milkweed it eats as a caterpillar. It may be the first butterfly to be depicted in art, in an Egyptian Fresco from 1500BC.
49.    Lion (Panthera leo)-Widely heralded as the Kings of the savannah, being the apex predator means lions are under threat from habitat depletion and retaliatory killing when they target livestock. They are particularly reliant on the wildebeest herds.
50.    Serval (Leptailurus serval) - One of Africa’s smaller cats at less than 1m tall. Their long legs help them patrol tall grass in search of rodents, and jump an incredible 3m to catch flying birds.
51.    Whistle-thorn acacia (Acacia drepanolobium)-This shrubby tree gets it’s name from the sound of the wind blowing into holes in it’s galls. The tree grows these swellings as homes for ants, which in turn protect it from herbivores by swarming and biting any animal that disturbs the branches.
52.    Fork-tailed drongo(Dicrurus adsimilis) -These small crow relatives hunt insects from perches, often following large herbivores which disturb their prey. Meerkats and mongoose use drongos as a predator alarm signal, but the drongos sometimes trick them to steal a prize meal.
53.    Maasai Giraffe(Giraffa tippelskirchi) -Ranging around Kenya and Tanzania, This Giraffe species is distinguished by its jagged brown patches and is the tallest species, at around 6m tall.
54.    Lilac-breasted roller(Coracias caudatus)- This jay-sized  bird has a beautiful patchwork of pink, purple blue and turquoise. It is no surprise that Kenya chose it as it’s National bird.
55.    Hooded vulture (Necrosyrtes monachus) -With it’s slender bill, this is the only vulture species to eat insects aswell as carrion.
56.    Ruppell’s Griffon Vulture (Gyps rueppellii) - The World’s highest flying bird, recorded at 11,000 metres. The roosting colony at Hell’s Gate National Park fly to the Maasai Mara to feed, around 185km away.
57.    Lappet-faced vulture(Torgos tracheliotos) -One of Africa’s largest and most aggressive vultures, this species can digest tough hide and sinew which others cannot deal with.
58.    Augur buzzard (Buteo augur) -Kenya’s commonest bird of prey over plains,highland moors and cultivated fields. Around 10% of the country’s population are completely black dark morphs.
59.    Swallows-Various swallow species are resident in Kenya, whilst our own, the Barn Swallow migrates here in the Northern winter. They mingle across the great plains chasing the abundant flying insects. Left to right: Wire-tailed swallow Hirundo smithii, Mosque swallow Cecropis senegalensis,Barn swallow H.rustica.
60.    White-fronted bee-eater (Merops bullockoides) -This species of bee-eater has a complex social system of family ‘clans’ with the members helping to rear each other’s offspring.
61.    Sausage fly (Dorylus sp).-This strange flying insect, looking like a cross between a wasp and a cranefly is actually a winged male driver ant.
62.    Martins-Close relatives of the swallows, martins have smaller, stockier bodies and shorter forked tails. From left to right: House martin Delichon urbicum, Sand martin Riparia riparia (both British migrants), Plain martin R. paludicola, Rock martin Ptyonoprogne fuligula.
63.    Swifts-Adding to the frenzy of aerial hunters, various swifts also winter in Kenya. They spend almost their whole lives in flight and tend to feed much higher than swallows and martins.
64.    Bateleur (Terathopius ecaudatus)-The swept-back wings and stubby, triangular tail make this handsome eagle very distinctive in flight. It’s name is French for “Street performer” as it’s wing-rocking motions resemble a balancing tightrope walker.
65.    Tawny eagle (Aquila rapax)-This powerful eagle can tackle hares and guineafowl, but also uses it’s veracity to steal food from other large birds such as fish eagles and storks.
66.    Lesser kestrel (Falco naumanni)- This species is smaller and more warmth-loving than the familiar Common Kestrel  (F. Tinnunculus) since it feeds mainly on insects.


Monday 6 January 2014

Z is for Zoothera

WHITE’S THRUSH ZOOTHERA DAUMA



Birds beginning with “Z” are not only rare alphabetically, but are super-rarities in Britain. The only other species on the British list are two sparrows, Zonotrichia leucophrys and Z. Albicollis all are rare vagrants (lost or accidental) with 100 records or less from Britain1.

White’s Thrush is a subspecies* of the scaly thrush Zoothera dauma subspecies aurea, named in honour of the famous British Victorian naturalist and Parson Gilbert White2. Whilst many thrushes have speckled breasts, scaly thrushes have black chevrons covering their whole body, giving them their namesake reptilian appearance. In flight they have striking black-and-white barred underwings and white tail edges.  At  27-31cm long and 140 grams, they are the largest thrush to visit Britain2. Though it’s unlikely to be heard on British soil, the song is rather uneventful for a thrush, just a series ofspaced-out whistles.

Concerning the scientific name, you might think based on the uniqueness of the word and the bird’s appearance that it means something interesting. It doesn’t. ’ Zoothera’ translates into the vague “animal hunter”, confusing since the thrush is not particularly carnivorous.  The origin of “dauma” is unknown!

The scaly thrush usually ranges across Asia, edging into Kazkhstan and Western Russia4. They are forest birds, but span widely from the sub-arctic conifer forests, or taiga in Siberia south to the tropical rainforests of Indonesia4.  They spend most of their time feeding on the ground, preferring to hide in undergrowth where their plumage camouflages them well amongst leaf litter and dappled shade. Like most thrushes, their diet is omnivorous including insects, worms, slugs, snails and berries2.

 White’s thrush itself breeds in the Russian taiga during the long northern summer days and takes a tropical winter retreat to South-East Asia5. They usually arrive in Britain when straying from their southward migration in September to November2.

Unsurprisingly given the distance from their normal range, White’s thrushes are classed as “accidental” in Britain, which, for birdwatchers translates into the more exciting-sounding “mega-rarity” and has twitchers flocking2,. They are a challenging spot, since they are typically shy and flighty birds. The first known British record is from Hampshire in 1828 and between 1950 to 2007 only 38 records have been made2.
The very latest record at time of writing is from St Agnes in the Isles of Scilly last November5, (Appropriately to its namesake, in the Parsonage garden)where the closest I got to seeing one was a taxidermy specimen in the Scilly museum, killed on arrival there in December 18866.



Steve William's view-October 2013


EcoGeek's view- March 2013














Zoothera dauma brings us to the finale of the “Avian alphabet of the British Isles”. I have proudly seen it through to the end just as the new year begins. I plan to do a final round-up post, but for the next two weeks I’ll be away in Kenya on a University trip! Though not British, I will of course be covering  the fantastic wildlife I will have hopefully seen when I return. 

It may be the end of the alphabet, but it is not the end of Amateur Ecogeek. A huge thank you and a happy new year to all my readers!





*or separate species, depending on who you believe.
ᵻ  “Twitcher” is too often confused with bird watcher. Twitchers build lists of species they have seen as a hobby (especially rare ones of course), and will travel great distances to see an unusual bird. Birdwatchers simply enjoy watching birds, as it says on the tin.


 References


1- British Ornithologist’s Union. (2013) The British List: List of Species Occurring in Britain. Available from:  http://www.bto.org/about-birds/birdfacts/british-list

2- R.A. Robinson. (2005) BTO BirdFacts: profiles of birds occurring in Britain & Ireland: White’s Thrush Zoothera dauma   [Latham, 1790]. (BTO Research Report 407). BTO, Thetford. Available from:  http://blx1.bto.org/birdfacts/results/bob11700.htm

3-BirdLife International. (2014) Species factsheet: Zoothera dauma. Available from: http://www.birdlife.org/datazone/speciesfactsheet.php?id=32154

4- Internet Bird Collection. (No date) Common Scaly Thrush (Zoothera dauma) . Available from: http://ibc.lynxeds.com/species/common-scaly-thrush-zoothera-dauma

5- Birdguides. (2014) White's Thrush (Zoothera aurea).Available from: http://www.birdguides.com/species/species.asp?sp=130233


6- Steve Williams . (2013) Finders report: White's Thrush St.Agnes Isles of Scilly Oct 2013. Available from: http://www.rarebirdalert.co.uk/v2/Content/finders_report_whites_thrush_scilly.aspx?s_id=330753265

Saturday 4 January 2014

Y is for Yellowhammer

YELLOWHAMMER (EMBERIZA CITRINELLA)



This sunflower yellow bunting compliments a balmy summer’s evening in a British field, when the males belt their song from high perches.  For many listeners, their reedy song is reminiscent of past country life.

Yellowhammers Emberiza citrinella get their name from the male’s bright plumage, with a yellow head and breast and streaky chestnut wings and body. As usual, the female is a bit plainer, but there is still a sunny glow within her streaky brown camouflage. As for the ‘hammer’, this is believed to originate from their Anglo-Saxon name “Amor”, and following old English “Amer” with the yellow a later descriptive addition 1,2.

The yellowhammer’s reedy, breathless song is famous for the mnemonic  “ a-little-bit-of-bread-and-no cheese”, made public through Enid Blyton’s children’s books3.  Though the song falls a little short, the phrase captures the tumbling notes and finishing wheeze. The male sits proudly on the tallest perch he can find to broadcast his ownership of his territory, repeating his song long into the summer.


Yellowhammers are birds of field and pasture, namely where there are hedgerows for sheltering, singing and nesting. Their summer song provides a traditional soundtrack for the harvest season. Though characterising the warmer months, they are surprisingly winter hardy for a small bird4, when they feed in flocks taking advantage of spilt grain and wild plant seeds. Yellowhammers are truly a farmland bird, and their small range keeps them faithful to the fields5.

But they are of course found in wilder places, in rough grassland, heaths and scrub. They are more associated with these habitats in the West, exemplified by Their Welsh name is Melyn yr Eithin-“Yellow bird of the gorse”2. They may also roost in reedbeds alongside their cousin the reed bunting E. schoeniclus and are occasional visitors to rural garden bird tables in winter when food is scarce5.

The yellowhammer’s main diet is seeds, including cereals, though they are not a serious pest. They exploit human offerings of grain from gamebird and livestock feeding stations and historically, leftovers from the harvest which may provide a winter lifeline.  They also eat berries and around a third of their diet is large, juicy insects such as grasshoppers, beetles and caterpillars, which the adults also rely on to feed their chicks5.

Courtship is a complex game for male yellowhammers. Instead of strutting his stuff like many cock birds, he gives up his usual dominant position over females and starts to play cat and mouse with his chosen mate. He follows her and bounces around vying for attention, but with every annoyed retort by the female, makes a mock retreat before resuming his chase back and forth6.

Yellowhammers nest on or near the ground, often at the base of hedgerows, amongst bramble or other scrubby plants. The outer cup is woven from dry grass and the favoured lining is horse hair, meaning the couple sometimes travel far out of their territory to find a paddock or stables7*.

Their four beige eggs are painted with chocolate brown squiggles to break up their outline, earning one of their older names “Scribble lark”1. Yellowhammers produce up to three broods a year3, the latest being most important for building numbers when winters are milder7.

Unfortunately, yellowhammers are not increasing . Though once widespread, they have followed the decline of other farmland birds.  Removal  and improper management of hedgerows, leaving short, sparse bushes that offer little cover, different timings and increased efficiency of harvesting and storage leaving little spilt grain in the winter and pesticides, herbicides and intensive pasture management have left fields bare of insects and weed seeds. Yellowhammers have sadly decreased by over 50% between 1970 and 2010 as farms become less hospitable5. There is also little of their natural habitat left to go back to, since much of our farmland was originally converted from grassland or heathland.

But it may not be all doom and gloom for this sunshine bird, since yellowhammers greatly benefit from agri-environment management schemes that encourage the maintenance of species-rich field margins, traditional hedgerow management, and sowing bird seed plots to provide winter food8, 9. Trials show that even if these are adopted on scattered farms, they benefit yellowhammer populations in the wider landscape8.

Though we’ll never completely go back to past farming techniques, with beauty and charm on it’s side, the yellowhammer is a great candidate for farmland conservation. With a little help, it’s cheesy song could remain soundtrack of the British countryside.



*Before human agriculture, yellowhammers would have sought hair from wild horses Equus ferus which lived in Europe until the early 20th century.




References

1-  Fransesca Greenoak. (1979) All the Birds of the Air. A. Brown and Sons.

2- Mark Cocker and Richard Mabey. (2005) Birds Britannica. London, Chatto and Windus
3- R.A. Robinson. (2005) BTO BirdFacts: profiles of birds occurring in Britain & Ireland: Yellowhammer Emberiza citrinella   [Linnaeus, 1758]. (BTO Research Report 407). BTO, Thetford. Available from:  http://blx1.bto.org/birdfacts/results/bob18570.htm

4- Peter Holden and J.T.R. Sharrock. (1988) The RSPB Book of British Birds. London, Papermac.

5- Peter Holden and Tim Cleeves. (2010) RSPB Handbook of British Birds (Third Edition). London, A&C Black.
7- John Welford. (2010) Facts about yellowhammers. Available from: http://www.critters360.com/index.php/facts-about-yellowhammers-8827/

8- RSPB. (2009) Farming: Advice for Farmers: Yellowhammer. Available from http://www.rspb.org.uk/ourwork/farming/advice/details.aspx?id=204089

9-RSPB. (No date) Our work: Projects: Yellowhammer Recovery Project. Available from: http://www.rspb.org.uk/ourwork/projects/details/220835-yellowhammer-recovery-project#achievements