ocr: BROOD PARASITES AISING YOUNG is hard work. R Brood parasites save a lot of effort by laying their eggs in other birds' nests and leaving the host bird to bring up their chicks. The HOST most successful brood parasites are cuckoos. Their eggs hatch quickly. CUCKOO The cuckoo chick immediately pushes CHICK any other eggs or hatchlings out of the nest. The host's chicks die, and CUP the cuckoo chick is left to eat all NEST the food its host parent brings. CUCKOO IN THE NEST A reed parbler feeds a young cuckoo. Despite the chick' 's buge size, the adult treats it like its own young.