The diversity of living things on Earth identifies those whose brains work pretty hard to dispute. The person on the list given to the first place, then the place was as follows.
Dolphin amazing creatures. Size brain dolphins in relation to the size of the body is much greater than that of chimpanzees. And their behavior indicates a high degree of mental retardation. Adult dolphin brain weighs about 1700 grams, and the person - in 1400. At the dolphin twice the convolutions in the cerebral cortex. Interestingly, most of the tricks that they teach is their everyday behavior. Dolphins love to play, racing, and enjoy life. They have a "vocabulary" to 14000 sounds, which allows them to communicate with each other, as well as self-awareness and emotional empathy, helpfulness and sick newborns, pushing them to the surface. Adults teach young dolphins.
Monkey First of all - gorillas, chimpanzees and orangutans. Based on the latest research, the genetic basis of human chimps coincides with 98, 7%. This suggests that the evolutionary path of humans and chimpanzees diverged six million years ago, in a global sense, practically yesterday. US Military used instead of astronaut chimps in many dangerous missions. A chimpanzee in Japan can use the computer, and probably at this very moment is developing Warcraft :) gorilla taught sign language, while orangutans exist tangled family relationships.
Elephant It is said - "The elephant never forgets." Indeed elephants are able to establish long-lasting friendships, remember and recognize a person through many years. They exhibit the ability to sympathize with the victims and regret. The ability to use tools and to find a solution to the situation. Elephants inherent in the concept of family. They have a musical ear and musical memory, capable of distinguishing three melody notes. Perhaps if they were smaller, would have a Facebook page and were able to use Twitter better than human.
Parrots Parrots are very intelligent. They are the only of these animals can carry on a conversation. Some parrots know hundreds of words and can use them quite consciously. Their relatively large brain, characterized by a good memory and the ability to onomatopoeia (voice well developed musculature).