Rook

The Rook is a large, glossy black corvid of open farmland, closely related to the Carrion Crow but distinguished by its bare, whitish-grey facial skin at the base of the bill in adults. Its plumage has a purplish-blue sheen in good light, and the feathers of the thighs are notably loose and shaggy, giving a "baggy trousers" silhouette.

Rooks have a peaked, high crown and a long, pointed, greyish bill. Juveniles lack the bare face patch and can be mistaken for Carrion Crows until they mature.

This is an intensely colonial species, famous for nesting in noisy, communal treetop colonies called rookeries.

Key field marks

• Bare, pale grey-white skin around the base of the bill (adults only)
• Peaked, angular crown shape
• Loose, shaggy "trouser" feathering on the thighs
• Purplish-blue gloss to black plumage in sunlight
• Long, pointed bill

Similar species

• Carrion Crow: fully feathered black face, no bare skin patch, straighter crown profile, more solitary habits
• Juvenile Rook: lacks the bare face patch and closely resembles a Carrion Crow — best told by shape (peaked crown, shaggy thighs) and its habit of associating with adult rooks

Behavior cues

Rooks are almost always seen in flocks, often walking and probing the ground on farmland, unlike the more solitary Carrion Crow.

Habitat

Rooks favor open farmland, pasture, and arable fields interspersed with mature trees, where they feed on the ground and nest colonially in the treetops.

Range

Widespread and common across most of Europe and temperate Asia, from Britain and Ireland eastward across the steppes to Siberia and parts of East Asia.

Migration

Western and southern populations are largely resident. Northern and eastern populations are migratory or partially migratory, moving south in winter and sometimes forming enormous mixed flocks with Jackdaws at communal roosts.

Behavior

Rooks are among the most social corvids, nesting, feeding, and roosting in large groups. Rookeries — colonies of stick nests built high in trees — can hold from a few pairs to several hundred, often reused and expanded year after year.

Voice

Calls include a harsh, nasal "kaah" or "caw," flatter and less resonant than the Carrion Crow's call, given frequently within noisy colonies.

Feeding

Rooks probe soil and short turf for invertebrates such as earthworms and leatherjackets, using their strong, pointed bill, and also take grain, seeds, and other plant matter.

Nesting and breeding

Pairs build bulky stick nests high in colonial rookeries, often in the same trees each year. Clutches usually contain 3–5 eggs, incubated by the female while the male provisions her.