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 ...

SPOILER ALERT: This article contains minor spoilers for “Cuckoo,” now playing in theaters. Roughly 40% of cuckoo bird species are “brood parasites.” Instead of building its own nest, the cuckoo ...