For the first time, scientists have found a bird species–Australia’s superb fairy-wren–that can spot a murderer. The killers are chicks of a particularly aggressive cuckoo species. The crime begins ...

It's not always easy spotting the cuckoo in the nest. But if you don't, you pay a high price raising someone else's chick. How hosts distinguish impostor eggs from their own has long puzzled ...

Some female zebra finches foist a part of their eggs on their neighbours. Scientists of the Max Planck Institute for Ornithology in Seewiesen discovered that in every fifth nest there is one egg that ...