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The bony-eared assfish has the smallest known brain–body mass ratio of all vertebrates [3] Brain size usually increases with body size in animals (i.e. large animals usually have larger brains than smaller animals); [4] the relationship is not, however, linear. Small mammals such as mice may have a brain/body ratio similar to humans, while ...
Brain size tends to vary according to body size. The relationship is not proportional, though: the brain-to-body mass ratio varies. The largest ratio found is in the shrew. [57] Averaging brain weight across all orders of mammals, it follows a power law, with an exponent of about 0.75. [58]
Mice have a direct brain/body size ratio similar to humans (1/40), while elephants have a comparatively small brain/body size (1/560), despite being quite intelligent animals. [18] Treeshrews have a brain/body mass ratio of (1/10). [19] Several reasons for this trend are possible, one of which is that neural cells have a relative constant size ...
Proxies for animal intelligence have varied over the centuries. One early suggestion was brain size (or weight, which provides the same ordering.) A second proposal was brain-to-body-mass ratio, and a third was encephalization quotient, sometimes referred to as EQ.
Since most of the brain is used for maintaining bodily functions, greater ratios of brain to body mass may increase the amount of brain mass available for more complex cognitive tasks. [2] Allometric analysis indicates that in general, mammalian brain size scales at approximately the 2 ⁄ 3 or 3 ⁄ 4 exponent of body mass. [3] Comparison of ...
Cephalopods have large, well-developed brains, [8] [9] [10] and their brain-to-body mass ratio is the largest among the invertebrates, falling between that of endothermic and ectothermic vertebrates. [11] The nervous system of cephalopods is the most complex of all invertebrates.
In the clade Neoaves, comprising all birds save fowl and paleognaths, the brain-to-body ratio increases, but this is driven primarily by a decrease in average body size. [ 22 ] [ 21 ] This pattern is observed in swifts , hummingbirds , sandpipers , buttonquails , as well as in the line leading up to Telluraves , the "higher landbirds".
The range with which the adult brain in all animals regardless of body size consumes energy as a percentage of the body's energy is roughly 2% to 8%. [3] The only exceptions of animal brains using more than 10% (in terms of O 2 intake) are a few primates (11–13%) and humans. [3]