What is the difference between the brains of various vertebrates? What is the reason for this?

If we look at the brains of fish, amphibians, birds, rabbits and dogs, we can be surprised that the forebrain and cerebellum increase in size, as well as have more folds and convolutions. But the midbrain is shrinking. This is due to the fact that mammals have more complex behavior and body structure than other mammals.



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