Dolphins have a large brain. Simply put, Dolphins have a lot in common with humans and they may be intelligent enough for actual human interaction. Although it may not be directly meaningful, in terms of brain size, the bottlenose dolphin brain averages 1.6 kg in size, by comparison, the average human brain weighs about 1.35 kg and a chimpanzee’s brain weighs 0.4 kg. Bottlenose dolphins are the type of Dolphins that have the largest brains among all animal kingdoms. Elephant brains also show a complexity similar to dolphin brains, and are also more convoluted than that of humans, and with a cortex thicker than that of cetaceans. But there are some fascinating similarities between a dolphin’s daily life and a human’s. Dolphins clearly demonstrate the ability to do all of these things and most scientists agree that dolphins are very intelligent creatures. Then there are the studies that show that dolphins can not only communicate with their own languages and discuss things like demographics, locations and genders; but also learn symbolic languages created by humans. Dolphins may be thought of as “a kind of alien intelligence sharing our planet” and “the closest we’ll come to encountering ET.” Although all species on Earth descend from a common ancestor, humans and dolphins have been on different evolutionary paths for aeons, resulting in the massive differences we see today. Dolphins and whales have the largest brains in the ocean – even larger than a humans! But mentally, dolphins are even more similar to humans. In the book The Dynamic Human, it is argued by a group of researchers from the University of Adelaide that humans aren’t the brightest crayons in the box. This type of interaction allows humans to find out more about the overall intelligence and behaviors of dolphins. Dolphin’s also have complex cultures including groups with assigned leaders. Dolphins hold many of the same chromosomes as humans. They are very much helpful to humans in solving different mysterious related to the oceans. And is it true that dolphins may have their own "language", of sorts? Large brain animals like humans, chimpanzees, and dolphins have a number of things in common. Dolphins have always been known to be intelligent but are classified below chimps in terms of smartness. Dolphin. Brain structure. 4. There is more interaction among dolphins and humans in captivity than in the wild. It is generally agreed that the growth of the neocortex, both absolutely and relative to the rest of the brain, during human evolution, has been responsible for the evolution of human intelligence, however defined. The issue is made more complex as humans tend to measure intelligence against their own understanding of it. What they use those brains for is a bit of a mystery. 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