Animals with higher intelligence have certain brain features that make them smarter. The neocortex is one of these, and it is necessary for complex cognition. Animals such as birds are less intelligent because they lack these structures..
All mammals have a neocortex, albeit the neocortex's dimensions and structural makeup vary widely among mammalian taxa. The neocortex performs cognitive, perceptual, logical, and motor control activities.
There is no neocortex in the tiny brains of birds, and they have different structures and connections than primates do. This should not come as a surprise considering that more nearly 200 million years ago, birds diverged from the evolutionary pathway that led to mammals, then to primates, and ultimately to humans.
Birds generally have brains that are larger than their heads. The tactile, as well as olfactory senses, as well as olfactory senses, are only fully realized in a small number of groups, but the auditory and visual senses are quite well developed in the majority of species. As well as calling and singing, birds also use visual cues to communicate.
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