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The first list shows number of neurons in their entire nervous system. The second list shows the number of neurons in the structure that has been found to be representative of animal intelligence. [1] The human brain contains 86 billion neurons, with 16 billion neurons in the cerebral cortex. [2] [1]
Sperm whales (Physeter macrocephalus) have the largest known brain mass of any extant animal, averaging 7.8 kg in mature males. [4] Orcas (Orcinus orca) have the second largest known brain mass of any extant animal. (5.4-6.8 kg) [5] Bottlenose dolphins (Tursiops truncatus) have an absolute brain mass
The sperm whale brain is the largest known of any modern or extinct animal, weighing on average about 7.8 kilograms (17 lb) [61] [62] (with the smallest known weighing 6.4 kilograms (14 lb) and the largest known weighing 9.2 kilograms (20 lb)), [44] [45] more than five times heavier than a human brain, and has a volume of about 8,000 cm 3. [63]
This is a list of notable films that are primarily about animals.This include film where the main characters are animals or the plot revolves around an animal. While films involving dinosaurs and other prehistoric animals are included on this list, those concerning legendary creatures, such as dragons, vampires, or animal-human hybrids like werewolve are not.
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 ]
Pages in category "Lists of largest animals" The following 20 pages are in this category, out of 20 total. This list may not reflect recent changes. *
The size of the brain is a frequent topic of study within the fields of anatomy, biological anthropology, animal science and evolution. Measuring brain size and cranial capacity is relevant both to humans and other animals, and can be done by weight or volume via MRI scans, by skull volume , or by neuroimaging intelligence testing .
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.