Each species has their different habits: a monkey jumps from branch to branch until it finds some fruit to eat, a bat flies around in the dark of the night between trees, a whale swims in the wide-open ocean. Since the brains of these animals help them to do all these tasks, we would guess that their brains would be very different. But it turns out that the main parts of the brain and the connections within the brain are all pretty much the same for all mammals. This similarity in brain structure exists because of the evolutionary history that all these brains share.
In fact, if we put brains of different mammals next to each other, the similarities are easy to spot. Even though the brains vary (a lot) in their size and in their folds, they all have the same parts. All these brains have a cerebral cortex, a cerebellum, and a brain stem. Also, the same kinds of cells make up all brains: they are made of neurons, glial cells, and the cells that make the capillaries (small blood vessels) that bring blood into the brain.

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