Data from: Brain regions associated with visual cues are important for bird migration

Orsolya Vincze, Csongor I. Vágási, Péter L. Pap, Gergely Osváth & Anders Pape Møller
Long-distance migratory birds have relatively smaller brains than short-distance migrants or residents. Here, we test whether reduction in brain size with migration distance can be generalized across the different brain regions suggested to play key roles in orientation during migration. Based on 152 bird species, belonging to 61 avian families from six continents, we show that the sizes of both the telencephalon and the whole brain decrease, and the relative size of the optic lobe...
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65 downloads reported since publication in 2015.

These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?