Did you know that cuckoo birds lay their eggs in the nest of another bird. That bird is then responsible for caring for the cuckoo birds offspring. In fact, the cuckoo birds offspring often kick the other eggs or young out of their new parents nest. They also require the new parent to work harder, to keep up with its feeding demands. And you want to know the kicker? The cuckoo bird is known as a brood parasite due to this behavior.