It is spring in a wetland and a reed warbler has built her nest and laid her eggs. But a crafty cuckoo is waiting nearby. When the warbler leaves her nest to find food, the cuckoo lays her own huge egg in the little bird’s nest. Then the female cuckoo flies away leaving the tiny warbler to raise the cuckoo chick as it grows bigger and bigger and bigger! In this purple-level reader, kids will discover the highly unusual life cycle of these migratory birds who spend the winter in Africa and the spring and summer in UK wetlands.