Mysterious, elusive, and full of surprises, this bird's behaviour will leave you questioning everything you thought you knew ...

For the care and feeding of its offspring, the common cuckoo outsources ... one of the eggs that’s been laid there and lays one of her own—a behavior known as brood parasitism.

incubating eggs, and feeding young. For hosts of brood parasitic birds, the costs of parasitism range from diminished nestling growth rate, due to competition with larger and more competitive ...

Eggshells are the second largest collection represented in ornithology after bird skins and this is one of the most important ... high variation in egg colour and pattern as a defence to brood ...