Grey-brown plumage; large, curved beak with casque diagnostic; long, graduated tail, tipped black and white. Casque smaller in female. The Malabar Grey Hornbill O. griseus (58cm), restricted to the W Ghats, south of Khandala, lacks casque on beak; dark tail tipped white, except on central feathers. Pairs or small parties; sometimes large gatherings; mostly arboreal, but descends to pick fallen fruit or lizards; feeds along with frugivorous birds on fruiting trees; noisy, undulating flight.