Cuculus fugax

Horsfield's hawk-cuckoo (also Hodgson's Hawk cuckoo), Cuculus fugax is a species of cuckoo.

C. Fugax evicts bona fide residents of the parasitized nest, thus becoming the sole occupant. Under normal circumastances, this would reduce the provisioning rate. To counteract this, C. fugax displays gape-coloured patches of skin under its wing to simulate additional gapes; the strategy appears to increase the provisioning rate.

Although the skin patch is not gape-shaped, it is convincing: host parents occasionally place food into the patch.