Great Hornbill

The great hornbill, also called the great pied or concave-casqued hornbill, is the heaviest of the typical hornbills. Its massive yellow bill carries a large yellow-and-black casque that is concave on top, with two ridges forming points at the front, which gives the species its Latin name bicornis, two-horned. The male spreads a yellow preen-gland oil on its bill and main wing feathers, which gives them their bright yellow colour. Females are smaller than males and have bluish-white rather than red eyes. The heavy wingbeats can be heard from far away, a whooshing sound likened to a steam locomotive starting up (Wikipedia, general species account).

Great hornbills are usually seen in small parties, with larger gatherings at fruiting trees. They eat mainly fruit, figs above all, and also hop along branches taking insects, lizards, nestling birds and small mammals. Pairs are monogamous and become very vocal in the breeding season, calling in loud duets of roars and barks. The female seals herself into a hollow in a tall old tree with a plaster made mostly of droppings and is fed by the male through a narrow slit while she incubates one or two eggs for 38–40 days and moults all her flight feathers. Because it needs big, old nesting trees, loss of old-growth forest is the main concern (Wikipedia, general species account).