Rhinoceros hornbill is one of the largest birds in rainforests of Asia. It is found in the forest from lowlands to 1,300m above sea level. It usually pairs for life and spend their entire lives on treetops. This hornbill is the one most likely to be recognised by its call, though occurring at low density. B. rhinoceros has black body, with a white abdomen and tail crossed by a wide black band. It also has an ivory white tinged yellow bill at the base and orange-red with a yellow tip casque (helmet-like structure) on top of the bill (Strange & Jeyarajasingam, 1993), which helps to amplify their calls. The calls or  the sounds can be distinguished by differently pitched in male and female with forceful hok, hok notes of the male from the female’s hak, hak notes.

This species is affected by the removal of their large nesting trees. It is also hunted for its meat and tail feathers, which are used for traditional costumes and dancing (BirdLife International, 2018).