The rook (Corvus frugilegus) is a member of the family Corvidae in the passerine order of birds. It is found in the Palearctic, its range extending from Scandinavia and western Europe to eastern Siberia. It is a large, gregarious, black-feathered bird, distinguished from similar species by the whitish featherless area on the face.

May 5, 2020 · In general, bird egg shells are made of calcium carbonate and so the default colour is white. But other pigments can create different colours and patterns. Birds that build their nests in trees and shrubs (like dunnock and blackbird) generally have blue or greenish eggs, either spotted or unspotted.

Lifecycle and body size information about Rook, including statistics on nesting, eggs and lifespan based on BTO ringing and nest recording data.

Rook eggs are about 4cm long, green and occasionally covered with dark spots all over. The eggs are laid in a large nest made of twigs, which is padded with various materials. Rooks lay 3 to 6 eggs [Photo: Vishnevskiy Vasily/ Shutterstock.com] What is the perfect habitat for rooks?

Worms, beetles and other invertebrates are the rook’s main food, which it catches by probing the ground with its large beak. It will also feed on grain, fruit, acorns and occasionally carrion and birds’ eggs.

Jun 3, 2023 · Learn about their appearance, expert egg-robbing skills, unique anting behavior, special memory, and preference for local breeding grounds. Also, explore the similarities and differences between rooks and their crow cousins.

Like all corvids, Rooks are opportunistic, resourceful birds, and they have a broad diet including insects, seeds, small birds and eggs, as well as small mammals. Rooks nest communally in the top branches of mature trees. These ‘rookeries’ can be very large and distinctive, with the messy nests clearly visible in bare branches over winter.

Rooks (Corvus frugi­le­gus) lay two to seven (av­er­age four) blue-green eggs that are cov­ered with brown and grey mot­tling. Rook eggs are very sim­i­lar in ap­pear­ance to those of ravens (C. corax), though slightly smaller, on av­er­age 40 mm long. After 16 to 18 days of in­cu­ba­tion mainly by the fe­male, the young hatch blind and help­less.

Rook birds are monogamous and form long-term pair bonds. Breeding usually begins in early spring, with nests being built in trees or on buildings. The female lays between 3-5 eggs, which are incubated by both parents for around 18-19 days.

Rooks are large members of the Corvidae family that live throughout Eurasia. The Rook is related to crows, ravens, jays, jackdaws, and more, and are similar in appearance to their crow cousins. The easiest way to distinguish between these birds and the other members of the corvid family is by looking at their faces.