The largest brain belongs to the sperm whale: 7 kg (17.5 pounds). By far, the smallest brain belongs to the Horned Politician (scientific name: Entitledous Parasapiens), indigenous to Washington, DC and capital cities in all 50 states. Proportionally, the smaller the animal (mammal), the larger the brain. well that actually depends on how you define "brain" if you think only vertebrates have a brain it sure is the blue whale, but if you considere any clumping of neurons in the part of the animal that by normal conventions would be considered the front, then there are many more options: e.g. Here the list of 10 most intelligent animals in the world. "The fruit fly is the smallest brain-having model animal. A brain is folded to increase the surface area for neurons. Human beings do not have the heaviest brains in overall weight, or even weight in proportion to their bodies. Also, the nerve center of the human brain is only slightly more complex than that of animals. Whether it's a dog versus a wolf, or even farmed trout compared to … Its brain is said to consist only of about 250,000 neurons, whereas it shows 'the rudiments of consciousness' in addition to its high abilities such as learning and memory." The basking shark is the largest animal to have the smallest brain. Most Smartest and Intelligent Animals on Earth. Science has proven that domesticated animals have significantly smaller brains than wild animals. No physiological explanation exists for man’s mind! The 10 Smallest Animals in the World. The complex society and the communication system follow by the ants are very tricky and fascinating. But when an animal lacks proper nutrition because it only eats food that its body wasn’t made for, or when creatures turn to humping something that could very well eat them, it does seem fair to call these animals stupid. These small primates are also unique because they have two very large ears that move independently from one another, allowing them to hear better to locate their prey. Brain size is an important part of animal anatomy, and has been studied by scientists as a potential indicator for intelligence. Koalas are terrible animals. There are those that argue that intelligence is a human standard and that animals cannot be evaluated on such terms. But a sperm whale, not generally considered to be as intelligent as a dolphin, has a brain that weighs about 17 pounds (7,800 grams). In terms of sheer size, the smallest brain would have to be the smallest organism that actually has a brain, which is probably the paramecium or similar one-celled organism (but you can argue whether or not this is actually a brain). 1. Encephalization quotient (EQ) The formula for the curve varies, but is usually given as Ew(brain) = 0.12w(body) 2/3. Squids: Squids are regarded as the brainiest invertebrates in the world. Brain size is typically determined by weight, although it can also be measured by skull volume. 1. The second list shows the number of neurons in their forebrain, a measure which has been … The ragworm, which is about the width of a hair, has … 10 Ant. Both dogs and orangutans are pretty smart animals, but they have small brains. Mice have a direct brain/body size ratio similar to humans (1/40), while elephants have comparatively small brain/body size (1/560), though elephants are obviously quite intelligent animals. Just like human babies, the younger an animal is, the more tender and cute they are. Koalas are fucking horrible animals. For every human on Earth, there are 1.5 million ants in 12000 species. World's smallest animal with a brain is a tiny relative of the humble earthworm and it is only the width of a human HAIR. flatworms Each eye is about the same size as its brain. Their brain structure is completely different from the other invertebrates in the ocean and has some complex features almost similar to the humans.