Data from: Light enough to travel or wise enough to stay? Brain size evolution and migratory behaviour in birds

Orsolya Vincze
Brain size relative to body size is smaller in migratory than in non-migratory birds. Two mutually non-exclusive hypotheses had been proposed to explain this association. On the one hand, the ‘energetic trade-off hypothesis’ claims that migratory species were selected to have smaller brains because of the interplay between neural tissue volume and migratory flight. In contrast, the ‘behavioural flexibility hypothesis’ argues that resident species are selected to have higher cognitive capacities, and therefore larger brains,...
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