Birds that need to fly further away have smaller brains. Non-migratory birds the smartest because exposed to variable climate and cold winters. https://www.nature.com/articles/ncomms13971 …pic.twitter.com/5y87TU3vdx
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@eawilloughby note that this study actually has its dataset attached, so you can play around with it too!
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Migratory birds would also have to have lighter brains to be more efficient, right?
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That's the theory yes.
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