Then there are animals

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Then there are animals that appear to have evolved specialised brain regions, which pump up the overall size of their brains compared to similar species. Take mormyrid fish, which have pretty big brains relative to their body size – similar in proportion to humans, in fact. These fish use electrical charges to communicate with one another and detect prey and in 2018 researchers found that a particular part of their brain, the cerebellum, is unusually hefty. No one is quite sure why this is but the authors of that study speculated that it could help the fish process electro-sensory information.

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