To distinguish the rook from other corvids, observe the bare patch of skin near the bill, which is absent in juveniles and other crow species. The rook's wings are also proportionally longer and narrower than those of the carrion crow when observed in flight. Juvenile rooks can be identified by their black plumage with a greenish gloss and the absence of the bare facial patch.
Rooks prefer open agricultural areas with pasture or arable land, provided there are tall trees suitable for nesting. They typically avoid dense forests, swamps, marshes, heaths, and moorlands. These birds are commonly found in lowland areas, often nesting near farms, villages, and open towns, but not in densely built-up regions.
The rook is found across the Palearctic, from Scandinavia and western Europe to eastern Siberia. The western rook subspecies is resident in the British Isles and much of north and central Europe, while the eastern rook subspecies ranges from central Siberia and northern Mongolia eastwards across Asia. Some northern populations may migrate southwards in winter to escape harsh conditions.
The rook's call is a distinctive caw or kaah, variable in pitch and used in different contexts. It is less raucous than that of the carrion crow and is often heard in flight or while perched, where the bird may fan its tail and bow with each call.
Rooks nest colonially in rookeries located at the tops of tall trees. Both sexes contribute to nest-building, which is a cup-shaped structure made of sticks and lined with softer materials. The breeding season begins in spring, with egg-laying occurring by the end of March or early April in Britain, and possibly later in eastern Europe and Russia. The clutch size ranges from three to five eggs, which are incubated primarily by the female.



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