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Nearly 40 species of dolphins swim the waters of the world. Most live in shallow areas of tropical and temperate oceans, and five species live in rivers.
Photo by redcharlie
Dolphins are highly intelligent. They are as smart as apes, and the evolution of their larger brains is surprisingly similar to humans.
Photo by Sergey Galyonkin
Dolphins are part of the family of whales that includes orcas and pilot whales. Killer whales are actually dolphins.
Photo by guille pozzi
Dolphins are very social, living in groups that hunt and even play together. Large pods of dolphins can have 1,000 members or more.
Photo by harrisongavin18
After birth dolphins are surprisingly maternal. They have been observed nestling and cuddling their young.
Photo by stretchdog
A dolphin calf nurses for up to two years. Calves stay with the mothers anywhere from 3 to 8 years.
Photo by suzyq212
Dolphins have acute eyesight both in and out of the water. They hear frequencies 10 times the upper limit of adult humans. Their sense of touch is well-developed, but they have no sense of smell.
Photo by Pagie Page
Dolphins have few natural enemies. Humans are their main threat. Pollution, fishing and hunting means some dolphin species have an uncertain future.
Photo by Ken Y.
Because Dolphins are mammals, they need to come to the surface of the water to breathe. Unlike land animals that breathe and eat through their mouths, dolphins have separate holes for each task. Dolphins eat through their mouth and breathe through their blowholes. This prevents the dolphin from sucking up water into the lungs when hunting, reducing the risk of drowning.
Photo by Noah Boyer
