To someone watching birds casually, the cuckoo’s behaviour looks almost lazy. Instead of gathering twigs, lining a nest, and feeding its chicks, the cuckoo quietly slips its egg into another bird’s ...

Does a cuckoo know it's a cuckoo? The answer is more difficult than you might think, explains Richard Pallardy ...

Female lineages of European cuckoos lay eggs with colorful shells and intricate patterns specialized to deceive more than 100 avian hosts into fostering their chicks. Parasitic cuckoo eggshells show ...

European cuckoos lay very different eggs depending on the host species. Genetic analyses have revealed how this adaptation is inherited without leading to speciation. Bright blue, white, greenish, ...