Hungry as a whole brood, the outsize baby devours everything brought by its foster parents—in the photo above, the provider is a reed warbler, a common host. Franka Slothouber, a retired photo ...

"We have a bird feeder, like most people," she said ... "The young cuckoo hatches after only 12 days and quickly pushes the hosts' eggs or babies out of the nest. After 19 days it leaves the ...