Avian Cooperation: Rooks Work Together to Solve Puzzle for Food Nests are built high in the trees and made of twigs and branches. These are broken off trees or stolen from a nearby nest. Some rookeries can contain thousands of birds, with their noisy calls making them easy to discover. 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

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