Environment
Big Brains Or Big Guts: Choose One
A global study comparing 2,062 birds finds that, in highly variable environments, birds tend to have either larger or smaller brains relative to their body size. Birds with smaller brains tend to use ecological strategies that are not available to big-brained counterparts. Instead of relying on the grey matter to survive, these birds tend to have large bodies, eat readily available food and make lots of babies.
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