Hornbills in the genus
Ocyceros are small Asian birds with curved triangular bills and grey plumage. As such, they are often called "grey hornbills". They have black and grey eye rings and their eyes are usually dark with black
irises. All of the
species have different coloured bills: the
Indian grey hornbill has a dark greyish bill, the
Sri Lanka grey hornbill has a pale yellowish bill, and the
Malabar grey hornbill has a more yellowish orange bill. == Species ==