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A 1977 study of roosting rooks by Ian Swingland showed that an inherent hierarchy exists within rook communal roosts. In this hierarchy, the most dominant individuals have been shown to routinely occupy the roosts highest in the tree, and while they pay a cost (increased energy use to keep warm) they are safer from terrestrial predators. [ 9 ]
Rooks are highly gregarious birds and are generally seen in flocks of various sizes. Males and females pair-bond for life and pairs stay together within flocks. In the evening, the birds often congregate at their rookery before moving off to their chosen communal roosting site.
Many kinds of birds are known to congregate in groups of varying size; a congregation of nesting birds is called a breeding colony. Colonial nesting birds include seabirds such as auks and albatrosses ; wetland species such as herons ; and a few passerines such as weaverbirds , certain blackbirds , and some swallows .
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Rooks nest in large, noisy colonies consisting of multiple nests, often untidily crammed into a close group of treetops called a rookery. The word might also be linked to the slang expression to rook (meaning to cheat or steal), a verb well established in the 16th century and associated with the supposedly thieving nature of the rook bird.
Successful males congregate in the same area as the previous breeding season because it is familiar to them, while females return to reunite with their males. Females do not return to a mating site if their male partner is not present. [40] Another possible explanation for lek stability is from male hierarchies within a lek.
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