Crows understand human faces, express complicated ideas, and plan.

Crows

Chimps are our closest animal relatives, therefore it's hardly surprise they're intelligent.

Chimpanzee

Elephants have the most intelligent brains. Elephants have as many neurons as humans in their cortex.

Elephants

Primate like humans and chimps. Koko the gorilla learned sign language and had a pet cat.

Gorillas

Cetaceans are as intellectual as birds and monkeys. Mammals include dolphins and whales.

Dolphins

Pigs solve mazes, grasp emotions and symbolic language. Piglets understand reflection before humans.

Pigs

Three-fifths of the octopus' neurons are in its arms.

Octopus

Parrots are as smart as children. These birds grasp problems and cause-and-effect.

Parrots

Man's best friend is smart and social. Dogs understand emotions, empathy, and symbolism.

Dogs

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