Cuculus optatus
Cuculus optatus, commonly known as the Oriental Cuckoo, is a medium-sized, highly secretive cuckoo renowned for its obligate brood parasitic lifestyle across a vast range spanning Asia and Australasia. Adults typically measure between 30-34 cm (12-13.4 in) in length, possess a wingspan of approximately 54-60 cm (21-24 in), and weigh 75-150g, exhibiting a sleek, falcon-like silhouette in flight. Distinctive field marks include a uniform grey head and upperparts, contrasting sharply with finely...
Primarily inhabits dense deciduous and mixed broadleaf forests, as well as coniferous woodlands and taiga, often breeding at higher elevations. In winter, it descends to lower altitude tropical and subtropical forests.
Feeds predominantly on large, often hairy caterpillars (which are toxic to many other birds), but also consumes other insects like beetles, grasshoppers, cicadas, and occasionally small fruits.
The Oriental Cuckoo is a solitary and remarkably secretive bird, typically active during daylight hours, though its distinctive calls are frequently heard at dawn and dusk. It forages stealthily within the canopy or mid-story of trees, often remaining hidden from view while preying on insects. As...
The Oriental Cuckoo's extensive breeding range stretches across northern and eastern Asia, encompassing eastern Siberia, Sakhalin Island, Mongolia, northeastern China, North and South Korea, and northern Japan. During the non-breeding season, these highly migratory birds undertake long-distance f...
Least Concern
- The Oriental Cuckoo is an obligate brood parasite, meaning it lays its eggs exclusively in the nests of other bird species, never raising its own young. - Its diet famously includes hairy caterpillars, which are toxic to most other birds, thanks to its specialized digestive system that sheds th...