Cuckoos are nest parasites. That means they lay eggs in the nests of other birds, which then put the effort into raising the chicks. So you’d think they’d be quiet about it. Yet female cuckoos have a ...

Cuckoo birds aren’t just the inspiration for intricate clocks. They’re also shameless parasites. Brood parasites, that is. Many species of cuckoos have been known to leave their eggs in other birds’ ...

Bird or beast? A cuckoo seems to have learned how to mimic the sounds made by the pig-like peccaries it lives alongside, perhaps to ward off predators. The Neomorphus ground cuckoos live in forests in ...