Animal Behavior 11e Video 4.1: Feeding behavior in gulls

A baby greater black-backed gull (Larus marinus) pecking at the red spot on its parent's beak, a classic case of an instinct being activated by an innate releasing mechanism upon detection of the releaser. The parent eventually regurgitates food for the chick.

Textbook Reference: Responding to Stimuli, p. 107