AP BIOLOGY

Detailed explanation-1: -It turns out that the aye-aye trumps the massive mammoth because, for their body size, an aye-aye’s brain is more enlarged. Humans claim the largest brain relative to body size at more than seven times the predicted size ratio.

Detailed explanation-2: -Despite this common scaling principle, however, brain size to body weight ratios differ from one taxonomic group to another (2). In primates, for example, the brains of apes are generally larger relative to body weight than the brains of monkeys, whereas the brains of monkeys are larger than those of prosimians (2).

Detailed explanation-3: -brains. Of all the terrestrial mammals, primates have by far the largest brains relative to their body size, with humans having the largest of all. The enlargement is almost exclusively in the neocortex, which makes up more than 80% of the mass of the human brain.

Detailed explanation-4: -Brains and intelligence in elephants and cetaceans Among mammals, Indian and African elephants, whales and most dolphins have brains that are larger to much larger than the human brain.