Birds and mammals have the largest brains in relation to their body. Apart from that, however, they have little in common, according to scientific opinion since the 19th century: mammalian brains have a neocortex, i.e. a cerebral cortex that’s made up of six layers and arranged in columns perpendicular to these layers. Avian brains, on the other hand, look like clumps of gray cells.
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Source: Phys.org