Come back to Japan in spring from the place where they spent winter. Live in sunny grassland with common reeds or highlands with Japanese larch. Live alone normally and rest on trees or electric wires to keep an eye on what is happening in surrounding areas. During breeding season, male warble “cuckoo” loudly and female chirp “pe pe pe pe” sharply. Prefers hairy caterpillars and hornworms but sometimes feed on eggs of birds and chicks. Are brood parasites which means to lay eggs on other bird’s nest. Lay eggs in nests of birds in acrocephalidae family, bull-headed shrike and bunting. The color of eggs varies but normally it becomes close to host birds’ ones. The breeding season is from May to August. Take one egg out from the nest and lay one egg instead. Hatched chick drop other eggs out from the nest.

●Body Length　　about 35 cm
●Season　　May to October (Summer bird, fly to one area from spring to summer for breeding and fly back to southern areas in autumn.)