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Animal brain size comparison

Biology | 7-14 yrs | Interactive, Learning Pod, Reading Pod

Are humans the most intelligent species on earth?

Scientists believe that humans are the most intelligent creatures on earth. Thus, it is concluded that human brain is the largest brain among all living beings on planet earth. The human brain weighs 1.1 kg to 1.4 kg.

What animals have the biggest brains?

Let us look at the size of brains of other living creatures on earth:

  • Sperm Whale – It is the largest toothed predator and has the largest brain weighing 7 kg. Compare it with the largest whale, the blue whale which has a brain of 5 kg.
  • Elephant – It has a brain size of 4.78 kg. The brain of an elephant makes up less than 0.1% of its body weight.
  • Mountain Gorilla – They are considered to have a good amount of intelligence with a brain that weighs 430 g. Brainy than a monkey whose brain size is only 22 g.
  • Chimpanzee – Compared to its body size, a chimpanzee has a brain size of 350 g. The brains of early humans were similar to those of chimpanzees.
  • Walrus – It has a brain size of 1.1 kg. This brain size comes very close to a human brain size. One half of the walrus brain remains active while it sleeps.
  • Dolphin – Positioned next to humans, a dolphin’s brain size is 2 kg. If trained, dolphins are sufficiently intelligent to grasp and learn several tasks.
  • Octopus – It is considered as the most intelligent invertebrate as its brain is made of the largest brain cells or neurons, found in nature. Its brain is made up of 500 million large neurons. Each of the eight arms of the octopus carries, a neuron package and its intelligence can be compared to that of a chimp.
  • Cats and Dogs – The brain of a cat is only 30 g in size. But cats learn by observation and have better short term memory. Dogs though have longer memory but their brain size is 30% lighter than those of wolves.
  • Alligator – One of the most ferocious predators, the reptilian alligator’s brain weighs only 8 g. They are roughly the size of three olives!
  • Giraffe – These tall animals have a brain half the size of humans. Their brains weigh only 680 g.
  • Rat – The size of a rat brain is only 2 g, while its body weight is 400 g. Rats have the ability to predict events and avoid danger and are experts in obtaining basic resources.