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Treeshrews hold about 10% of their body mass in their brain. [16] Generally speaking, the larger the animal, the smaller the brain-to-body mass ratio is. Thus, large whales have very small brains compared to their weight, and small rodents like mice have a relatively large brain, giving a brain-to-body mass ratio similar to humans. [4]
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]
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 ...
They have one of the highest brain-to-body mass ratios [27] and the largest brain size of all fish. [28] Their brains have retia mirabilia which may serve to keep them warm. [29] M. alfredi has been shown to dive to depths over 400 metres (1,300 ft), [30] while the Chilean devil ray, which has a similar structure, dives to nearly 2,000 metres ...
Jerison (1973) has suggested that the degree of brain encephalization (the ratio of brain size to body size, EQ) may correlate with an animal's intelligence and cognitive skills. [30] Corvids and psittacids have higher EQ than other bird families, similar to that of the apes. Among the Corvidae, ravens possess the largest brain to body size ...
The unusual high brain energy consumption percentage of mormyrinae fish is thus due to them having the unusual combination of a large brain in a low energy consuming body. [1] The actual energy consumption per unit mass of its brain is not in fact particularly high and indeed lower (2.02 mg g 1 h 1 ) than that in some other fish such as ...
Your brain accounts for only about 2% of your body weight, but it uses roughly 20% of your body’s total energy. Even when you’re sleeping , your brain is burning tons of energy just to keep ...
Of all studied sharks, the shortfin mako has one of the largest brain-to-body ratios. [citation needed] This large brain size prompted New Zealand Sealife Australia and New Zealand senior curator Craig Thorburn of Auckland, New Zealand, and film-maker Mike Bhana to investigate the intelligence of the shortfin mako. From tests involving shape ...