Tweet Of The Day

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Sir David Attenborough presents the widespread marine species, the white tern. Also known as fairy terns or angel terns, these are very slender, long-winged birds, brilliant white except for a black, slightly-upturned bill, dark eyes and very short blue-grey legs. In flight, their wings appear almost translucent. For such a delicate-looking bird, they have rather harsh calls. Unusually they lay their eggs on a bare branch. The female tern selects a small groove in the bark or on the leaf-stalks of palms where her single egg will be most secure. Here, on its tropical tightrope, the egg is safer from ground predators like rats and because there's no nesting material, there's less chance of parasites.Producer : Andrew Dawes

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Sir David Attenborough presents the mimic specialist Greater Hill Mynah from Asia. Like many members of the starling family, Greater Hill Mynah's are superb mimics with a remarkable ability to reproduce the tones of the human voice. This makes them popular as cage and now some wild populations have been severely reduced by collecting. Hill mynahs are not just vocally outstanding. They're dapper looking birds too; glossy purplish-black with a white wing-patch and wattles of bright yellow skin under their eyes and around the back of their necks. The wild birds don't impersonate people though; it's only those captive birds which are amongst some of the best mimics of the human voice.

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Sir David Attenborough presents Australia's laughing kookaburra. At 45cm the laughing kookaburra is one of the world's largest kingfishers. Native to south and eastern Australia, they have now been introduced to Western Australia and parts of New Zealand. Although they do catch fish, they hunt mainly on land where they eat reptiles, small mammals and invertebrates. The cacophony of loud hooting laughs from which they get their Aboriginal name, is often produced by several birds in chorus. The cackling call is one of the few exotic bird sounds that is recognised around the world: a captive kookaburra named Jacko became a radio celebrity in Australia through his ability to break into that laughing call on demand. By the time of his death in 1939 he was one of the best known birds in the world.Producer : Andrew Dawes

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Sir David Attenborough presents the red-throated caracara from the Amazonian rainforest. The size of buzzards, red-throated Caracaras are black- and -white birds of prey that travel together when searching for paper wasp nests among the leaves. While some birds search for food, others act as sentinels on the lookout for predators. If a monkey or a spotted cat approaches, the sentinel will alert the flock and together they will mob the intruder with loud calls. They specialise in bee and wasp grubs, but seem impervious to stings and it was once thought that they may possess a special repellent which deters the adult insects. Latest research now shows that when they are disturbed by the caracaras, paper wasps keep away from their damaged nest to avoid further danger and so the birds simply take advantage of the wasp's absence.

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Sir David Attenborough presents the wandering albatross of the South Atlantic Ocean. On the windswept South Georgian Islands, a stiff breeze is ruffling the grass tussocks as a Wandering Albatross is billing and coo-ing to its mate. These huge seabirds, mate for life and can live for 50 years (or more). Longevity is vital for a species which produces only one chick every two years. The chocolate brown youngster takes to the air nine months after hatching, the longest pre-fledging period of any bird, but when it does, it breaks another record, as adults have the longest wingspan of any living bird, which can reach over 5metres.Producer : Andrew Dawes

Tweet of the Day is the voice of birds and our relationship with them, from around the world.Sir David Attenborough presents the Christmas shearwater. 2000km south of Hawaii the highly marine Christmas shearwater is at home over the Central Pacific seas, tirelessly riding the air-currents, skimming wave-crests and hugging the contours of the sea looking for food. They rarely come to land as adults, but when they do, it is to return to their place of birth on remote oceanic islands to breed. Here they form loose colonies, laying a single white egg which is incubated for around 50 days. Inhabiting these far flung inaccessible islands means little is known about their biology, but that remoteness gives them protection from land based predators.

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Sir David Attenborough presents the house wren found across the New World. Having one of the largest ranges of any songbird in the New World, the migratory house wren occurs anywhere from their breeding grounds in Canada and North America, to their to wintering grounds from Central America to Chile. The male house wren's song is a torrent of trills delivered at full volume from his territory of shrubs, low trees and ferny banks. Diminutive he may be but he's feisty and is known to drag other birds' eggs or chicks from a nest-hole he wants for himself. In parts of North America, house wrens are a significant cause of nest failure in some other species of songbirds.

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Sir David Attenborough presents the hyacinth macaw of the Brazilian Pantanal. Raucous ear-piercing screeches are produced by one of the most beautiful parrots in the world, flying high over the marshy wetlands of the Pantanal. As their name suggests they are a rich cobalt blue, with sulphur-yellow eye rings with a massive bill and long elegant tail-feathers streaming behind them in flight, making them our longest parrot. Popular as captive caged birds, they are now endangered in the wild and legally protected in Brazil. They feed on palm nuts, including those of the acuri palm which are so hard that even the macaw's powerful bill can't break into them, until they've first passed through the digestive tracts of cattle. Producer : Andrew Dawes

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Sir David Attenborough presents the New Zealand robin. The toutouwai or New Zealand robin may share a name with the more familiar European robin, but it is a very different bird to the robin redbreast we know so well. Although about the same size with the same perky upright stance, the New Zealand robin, is appropriately enough nearly all-black, with a pale belly and a white splash just above the bill, but no trace of red. Three subspecies exist; one in north Island, one in South Island, and another in Stewart Island. And like their British counterparts, who they are not closely related to at all, can become quite tame and friendly to humans. The song is very varied and each male has a repertoire of around two dozen different notes.Producer : Andrew Dawes

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Liz Bonnin presents the eastern orphean warbler in an olive grove near Athens. Until recently there used to be just a single species of Orphean Warbler; a summer visitor to southern Europe, North Africa and western Asia: a handsome bird much like a large blackcap with a white throat and greyish-brown back. But across the wide breeding range which stretches from Portugal to Pakistan some orphean warblers look and sound different. Those east of Italy tend to be subtly greyer above and paler beneath. And the songs of birds from Greece eastwards are longer and richer, often including the richness of nightingale like notes. These slight differences have persuaded many ornithologists that the Eastern Orphean warbler is a different species to the Western Orphean Warbler. Biologists call this "splitting "although exactly where these new species boundaries lie is a moot point.Producer : Andrew Dawes

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Liz Bonnin presents the greater racket-tailed drongo of South-East Asia. Across a clearing in a Malaysian forest flies a dark bird, seemingly chased by two equally dark butterflies. Those butterflies in hot pursuit aren't insects at all; they are the webbed tips of the greater racket-tailed drongo's excessively long wiry outer-tail feathers, which from a distance look like separate creatures as it flies. Glossy blue-black birds which live in wooded country and are great insect catchers, hawking after them in mid-air before returning to a perch. They're bold too and won't hesitate to harry and chase much larger birds than themselves, including, birds of prey. Like other drongos the greater racquet-tailed drongo has an extensive but not very musical repertoire which includes the sounds of other birds it meets, when it joins mixed feeding flocks, and can imitate the call of a hawk to alarm the hawk's victims and so st

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Liz Bonnin presents the formerly widespread saddleback of New Zealand. It's loud, piping and whistling calls once resounded throughout New Zealand's forests, but now the saddleback is heard only on smaller offshore islands. This is a bird in exile. About the size of a European blackbird, saddlebacks are predominantly black with a rust-coloured saddle-shaped patch on their backs. In Maori culture this mark came from the demi-God Maui who, after trying to catch the sun, asked the saddleback to fetch water. The bird refused, so hot-handed Maui grabbed it and left a scorch mark on the bird's back. As well as this chestnut saddle, the bird has two bright red wattles at the base of its beak which it can dilate when it displays. It also has an extensive vocabulary and one of its calls has earned it the Maori name –"Ti-e-ke".Producer : Andrew Dawes

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Liz Bonnin presents the advancing, leaping and queuing male blue manakin of Brazil. Male blue manakins are small, blue and black birds with scarlet caps. They live in the forests of south-east Brazil and neighbouring areas of Argentina and Paraguay. Whilst their plumage is eye-catching, their mating display is one of the strangest of any bird. A dominant male Blue Manakin enlists the support of one or more subordinate males. Calling loudly, all the males sidle along a branch towards the female, taking turns to leap into the air and then fly back down and take their place at the back of the queue. This sequence of advancing, leaping and queuing occurs at a frenetic pace, until, without warning, the dominant male calls time on this avian dance-off, with a piercing screech.

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Liz Bonnin presents the Nene, or the endemic and rare Hawaiian goose. Visit a Wildfowl and Wetland Trust centre in the UK and it is likely you'll be mobbed by the nasal calls of one of the world's rarest birds, the Hawaiian Goose or "Ne-Ne". In the late 18th century there were around 25,000 of these neat attractive geese, with ochre cheeks and black-heads, on the Hawaiian Islands. But by the early 1950s, due to development and introduced predators, a mere 30 or so remained. A few of these remaining Nene's were taken to Slimbridge, home of Peter Scott's Wildfowl Trust as part of a captive breeding programme. They bred successfully and now many generations of geese produced there have been returned to their native islands. Their future is still precarious in the wild, but as the state bird of Hawaii the Nene's outlook is more secure today than for the last seventy years.

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Liz Bonnin presents the morepork or Ru-Ru, New Zealand's only surviving native owl. Strange double notes in the forests of New Zealand were once thought to be cries from the Underworld. But these calls are most likely to be that of a morepork calling. Its familiar call earned it the alternative Maori name of "ruru". Largely nocturnal, it has brown, streaky feathers and large bright yellow eyes which are well adapted for almost silent night hunting forays for large insects, spiders, small birds and mammals. In Maori mythology, moreporks, or "ruru" are spiritual birds, and can represent the ancestral spirit of a family, taking the form of a woman known as "Hine-Ruru" or "owl woman" who acts as a guardian, protecting and advising the family members.

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Liz Bonnin presents the gaunt undertaker-looking marabou stork in Africa. It is not very scientific to describe a bird as ugly, but the marabou stork would not win any prizes for beauty or elegance. This bulky stork, with a funereal air, has a fleshy inflatable sac under its throat which conspicuously wobbles as it probes African rubbish dumps for carrion. Seemingly more at home amongst the melee of vultures and jackals squabbling over a carcass, it is known in some areas as the undertaker bird. But, in the air the marabou stork is an elegant sight. It has one of the largest wingspans of any bird, up to 3 metres across. Soaring effortlessly on these broad wings the storks scan the sub-Saharan landscape for food. Marabou storks are doing well, thanks to our throwaway society and they've learned to connect people with rubbish – a salutary association one might say.Producer : Andrew Dawes

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Liz Bonnin presents the northern jacana at home in Central American wetlands. A cross between a coot and a plover, northern Jacanas are found in swamps in Central America and Mexico. They're long legged birds with a black head and neck, and a chestnut body with yellow highlights. And, northern jacanas are polyandrous; the females have more than one partner. Males build platforms of floating vegetation and attract females by calling or posturing. If a female mates with a male, he may use his platform as a nest for her eggs. The female doesn't care for the eggs, but goes in search of up to three other mates. The result is that a single female may have several males raising different clutches of eggs for her and each clutch may contain the eggs of more than one male!Producer : Andrew Dawes

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Liz Bonnin presents the North American black chinned hummingbird. What seems to be a large green beetle is flying erratically across a Los Angeles garden: suddenly, it hovers in mid-air to probe a flower bloom; this is a black-chinned hummingbird. Although often thought of as exclusively tropical, a few species of hummingbirds occur widely in North America and in the west; the Black-chinned hummingbird is the most widespread of all. Both sexes are glittering emerald above: the male's black throat is bordered with a flash of metallic purple, which catches the sun. Black-chinned "hummers" are minute, weighing in at just over 3 grams. But they are pugnacious featherweights seeing off rival males during intimidation flights with shrill squeals, whilst remarkably beating their wings around 80 times a second. They'll also readily come to artificial sugar-feeders put out by householders to attract these flying jewels to t

Tweet of the Day is the voice of birds and our relationship with them, from around the world. Liz Bonnin presents the red-crowned crane from Japan and Asia. Backlit by a Japanese winter sun, huge black and white birds dance for an audience. Their plumage mirrors the dazzling snow and dark tree-trunks. The only spots of colour are crimson - the caps of these Red-crowned Cranes. Red-crowned Cranes breed only in far-eastern Russia. Tall, majestic and very vocal, red-crowned cranes gather in groups to reinforce pair-bonds, by leaping into the air and fluttering their 2.5 metre wings, sometimes holding sticks or twigs in their long bills. During winter months, the cranes are fed with grain, and receive a stream of captivated visitors. In front of a wall of clicking camera shutters, the cranes perform their elaborate dance, to delight their captivated audience.Producer : Andrew Dawes

Tweet of the Day is the voice of birds and our relationship with them, from around the world.Chris Packham presents the brown thrasher, usually seen in North America. Brown thrashers are related to mockingbirds that breed across most of eastern and central North America. They're famous for their vast repertoire which can include over 1000 song types. They spend much of their time skulking in dense shrubs at woodland edges and in parks and gardens. They're russet on top, white below and heavily streaked like a large thrush but with much longer tails and stout curved bills. Their name comes from the noisy thrashing sound they make as they search the leaf litter for food. Normally, brown thrashers are short distance migrants within North America but in 1966, in November of that year, in Dorset, birdwatchers almost dropped their binoculars in disbelief when they heard the call of a brown thrasher coming from a coastal thicket. It remained here until February 1967 and is the only British record.