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Cuckoos lay their eggs in the nests of superb fairy-wrens, leaving all the hard work of raising the chicks to the wrens. But superb fairy-wrens have a remarkable strategy for recognizing their own chicks. They teach their young a secret password that helps distinguish them from. . . Read More

Cuckoo finches are brood parasites – they lay their eggs in other birds’ nests, hoping to trick the host bird into raising their chicks. Hosts do their best to detect and reject foreign eggs in their nests, but brood parasites are masters of exploiting cracks in their. . . Read More