The birds take to the skies en masse after calling out their 'vote', scientists have discovered.
Jackdaws use a "democratic" process to decide when to leave their roosts en masse, scientists have discovered.
It's a rare insight into how animals make group decisions, Alex Thornton, professor of cognitive evolution at University of Exeter, told BBC News. Jackdaws want to leave the trees together because it protects them against predators or is useful for "information-sharing", Prof Thornton suggests.
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