The relationship between brain size and intelligence has been a controversial and frequently investigated question. In 2021 scientists from Stony Brook University and the Max Planck Institute of Animal Behavior published findings showing that the brain size to body size ratio of different species has changed over time in response to a variety of conditions and events.

As Kamran Safi, researcher at the Max Planck Institute of Animal Behavior and the study's senior author writes:

"Sometimes,

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