Cálao Pardo de Austen vs Cálao Pardo de Tickell

The most reliable field mark to distinguish the Brown Hornbill from the Rusty-cheeked Hornbill is the coloration of their cheeks and throat. The Brown Hornbill typically has a more uniformly brown plumage, while the Rusty-cheeked Hornbill displays a distinct rusty coloration on its cheeks and throat.

Look for the rusty coloration on the cheeks and throat to identify the Rusty-cheeked Hornbill. In contrast, the Brown Hornbill will have a more uniform brown appearance.

The Brown Hornbill has a more uniformly brown plumage, whereas the Rusty-cheeked Hornbill is characterized by its rusty-colored cheeks and throat.