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What animal has the largest brain?

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The largest brains are those of sperm whales, weighing about 8 kg (18 lb), and killer whales, weighing about 12–15 lb (5.4–6.8 kg). An elephant's brain weighs just over 5 kg (11 lb) and a bottlenose dolphin's 1.5 to 1.7 kg (3.3 to 3.7 lb). Brain size tends to vary according to body size. read more

1. The largest brain belongs to the sperm whale: 7 kg (17.5 pounds). The blue whale, the largest animal on the planet, being twice longer and thrice heavier, has a brain weighing 5 kg (12.5 pounds). 2. Human brain has an average weight of 2.7 pounds (1.2 kg), variations between 1.1 and 1.4 kg being considered normal. read more

On the other hand, some relatively “smart” animals have small brains – for example, dogs and orangutans: A beagle's brain is about 2.5 ounces, and an orangutan's brain is about 13 ounces. In general, the larger the animal, the larger the skull, and therefore, the larger the brain. read more

While the dolphin's brain weight is just above that of the human brain at 3.5 pounds, the brain makes up about 1.19 percent of the total body mass, slightly less than that of a human. A dolphin, like a human, has a large neocortex in comparison to other animals. read more

Brain size has increased considerably over the course of humans' recent evolutionary history. Homo erectus, a relative of humans, had a brain size of 1,100 cm 3. Homo floresiensis, with a brain size of 380 cm 3. read more

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