Common cuckoo

The common cuckoo is a medium-sized bird found across Europe and Asia. It's best known for its sneaky habit of laying eggs in other birds' nests. Their distinctive 'cuck-oo' call is a classic sound of spring in many woodlands.

• Lays eggs in other birds' nests instead of building its own
• Young cuckoos push host eggs out to get all the food
• Adults eat hairy caterpillars that most birds avoid