Cuckoos - Tent Caterpillar Birds

Cuckoos eat hairy tent caterpillars that most birds avoid, using their beaks to remove some of the irritating hairs before consumption. Their stomachs accumulate indigestible hairs over time, leading to periodic shedding of the stomach lining. This adaptation allows cuckoos to exploit a food source with little competition.

Discover how cuckoos uniquely adapt to eat a toxic food source by shedding their stomach lining—a rare physiological trait in birds.

1. 01Cuckoos specialize in eating tent caterpillars, a food source avoided by most birds due to irritating hairs.
2. 02They physically manipulate caterpillars with their beaks to remove some hairs before eating.
3. 03Cuckoos periodically regurgitate their stomach lining when it becomes clogged with indigestible caterpillar hairs.