Which one of the following animals has the largest brain in proportion to its body size?

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Birds

Dolphin

Cockroach

Elephant

answer is D.

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Detailed Solution

Dolphin is a cetacean mammal. Its brain is the largest in proportion to its body size.

All cetaceans have the highest brain-to-body weight ratio, but dolphins have the highest among the rest. Bottlenose dolphins have larger brains than humans, with a brain-to-body-weight ratio that is higher than that of great apes.

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