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An elephant's brain weighs just over 5 kg (11 lb), a bottlenose dolphin's 1.5 to 1.7 kg (3.3 to 3.7 lb), whereas a human brain is around 1.3 to 1.5 kg (2.9 to 3.3 lb). 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]
The human brain contains 86 billion neurons, with 16 billion neurons in the cerebral cortex. [ 2 ] [ 1 ] Neuron counts constitute an important source of insight on the topic of neuroscience and intelligence : the question of how the evolution of a set of components and parameters (~10 11 neurons, ~10 14 synapses) of a complex system leads to ...
Brain of the sperm whale, considered the largest brain in the animal kingdom. Sperm whales (Physeter macrocephalus) have the largest known brain mass of any extant animal, averaging 7.8 kg in mature males. [5] Orcas (Orcinus orca) have the second largest known brain mass of any extant animal. (5.4-6.8 kg).
Typically, Old World monkeys (paleotropical) are larger than New World monkeys (neotropical); the reasons for this are not entirely understood but several hypotheses have been generated. [3] As a rule, primate brains are "significantly larger" than those of other mammals with similar body sizes. [4]
Dolphins have the highest brain-to-body weight ratio of all cetaceans. [11] Monitor lizards, tegus and anoles and some tortoise species have the largest among reptiles. [citation needed] Among birds, the highest brain-to-body ratios are found among parrots, crows, magpies, jays and ravens. Among amphibians, the studies are still limited.
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The oceanic manta has one of the largest brains, weighing up to 200 g (7.1 oz) (five to ten times larger than a whale shark brain). It heats the blood going to its brain and is one of the few animals (land or sea) that might pass the mirror test, seemingly exhibiting self-awareness. [26]
To mark the first World Encephalitis Day, creation of the Encephalitis Society, he initiated the "World’s Biggest Brain", winning a Guinness World Record for the largest human image of an organ. [ 51 ] [ 52 ]