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www.reference.com/article/characteristics-dolphins-9af076627246f4d7

Dolphins are members of the Odontoceti, a suborder of cetaceans - that is, all whales, dolphins and porpoises - that means "toothed whales." There are approximately 40 species of dolphins and all are carnivores, primarily subsisting on fish and cephalopods.

www.reference.com/article/dolphins-9d14993634a6bbe

Dolphins are mammals found in the sea and are part of the toothed whale family. They are grey with backs that are darker than the rest of their bodies.

www.reference.com/article/different-types-dolphins-3f67ca053f252cc0

There are 36 different species of dolphins throughout the world. Thirty-two of these species are oceanic dolphins that live in saltwater, while four are river dolphins that live in freshwater.

www.reference.com/article/dolphins-live-5521b18ce751e891

Dolphins are equipped with blowholes on the crowns of their heads through which they breathe air when they reach the surface of the water. They are capable of holding their breath for up to 10 minutes.

www.reference.com/article/eats-dolphins-9a64dcce0785afbc

Sharks, killer whales and humans are the primary eaters of dolphins. Dolphins are near the top of the food chain and employ many defensive strategies, so they are not often eaten by predators.

www.reference.com/article/dolphin-eat-61c2ed191f39e07b

Dolphins are active, opportunistic predators that feed on many different kinds of fishes, squids and crustaceans. Their diet varies according to what is geographically available. Fishes and squid are staples for offshore dolphins, and coastal dolphins rely mainly on fis...

www.reference.com/article/adaptations-dolphins-3eb03b4d04bc0911

Among the adaptations of dolphins are hydrodynamic bodies, blowholes on top of their heads, flippers and flukes and echolocation. Some scientists believe that dolphins are able to enjoy the benefits of sleep even while they're in the water by having one half of their br...