Crows and other birds of the Vranov family (for example, rooks and magpies) are very intelligent creatures, which also means that they can be cunning and malicious. For example, they like to bite the tails of other, larger animals and bounce off when the beast tries to take revenge. Crows are trolls in the kingdom of beasts!
Probably, in this way the birds are trying to drive away larger predators from food. So the birds of the vranov family steal someone else's food or just check the level of aggression of another animal.
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