Great Hornbill

Description:

spotted at houston zoo. The Great Hornbill (Buceros bicornis) also known as Great Indian Hornbill or Great Pied Hornbill, is one of the larger members of the hornbill family. Great Hornbills are found in the forests of Nepal, India, the Malay Peninsula and Sumatra, Indonesia. Their impressive size and colour have made them important in many tribal cultures and rituals. The Great Hornbill is long-lived, living for nearly 50 years in captivity. They are predominantly frugivorous although they are opportunists and will prey on small mammals, reptiles and birds. The Great Hornbill is a large bird, 95–130 cm (37–51 in) long, with a 152 cm (60 in) wingspan and a weight of 2.15–4 kg (4.7-8.8 lbs). It is the heaviest, but not the longest, Asian hornbill. The most prominent feature of the hornbill is the bright yellow and black casque on top of its massive bill. The casque appears U-shaped when viewed from the front and the top is concave with two ridges along the sides that form points in the front, a reference to which is made in the Latin species epithet bicornis. The casque is hollow and serves no known purpose although they are believed to be the result of sexual selection. Male hornbills have been known to indulge in aerial casque butting, with birds striking each other in flight.[3] Females are smaller than males and have bluish-white instead of red eyes although the orbital skin is pinkish. Like other hornbills, they have prominent "eyelashes". The back of the casque is reddish in females while the underside of the front and back of the casque is black in males. The male spreads the preen gland secretion which is yellow onto the primaries and bill to give them the bright yellow colour.The commissure of the beak is black and has a serrated and worn edge with age. The wing beats are heavy and the sound produced by birds in flight can be heard from a distance. The sound produced has been likened to the puffing of a steam locomotive starting up. The flight involves stiff flaps followed by glides with the fingers splayed and upcurled. They are sometimes known to fly at great height over forest.

Habitat:

The distribution of the species is fragmented over its range in South and Southeast Asia. In South Asia they are found in a few forest areas in the Western Ghats and in the forests along the Himalayas. Their distribution extends into Thailand, Burma, Malaya and Sumatra.Their habitat is dense old growth (unlogged) forests in hilly regions. They appear to be dependent on large stretches of forest unlike many of the smaller hornbills. In Thailand the home ranges of males was found to be about 3.7 km² during the breeding season and about 14.7 km² during the non-breeding season.

Notes:

Roost sites are used regularly and birds will arrive punctually at sunset from long distances, following the same routes each day. Several tall trees in the vicinity may be used, the birds choosing the highest branches with little foliage. They jockey for positions until late at dusk. When sleeping they draw their neck back and the bill is held upwards at an angle. Due to habitat loss and hunting in some areas, the Great Hornbill is evaluated as Near Threatened on the IUCN Red List of Threatened Species.