Every single dolphin species on Earth — all 41 of them!
Yes, dolphins are mammals — not fish. They breathe air through a blowhole, are warm-blooded, give birth to live young, and nurse their babies with milk. There are 41 known dolphin species living in oceans and rivers worldwide. Dolphins are among the smartest animals on Earth: they recognize themselves in mirrors, communicate with unique whistles, and hunt cooperatively in pods.
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Last updated: May 2026
Dolphins are mammals. They breathe air through a blowhole, are warm-blooded, give birth to live young, and nurse their calves with milk — just like humans and dogs.
The orca (killer whale) is the largest dolphin at up to 32 feet (10 m). The common bottlenose dolphin is 6–13 feet. The smallest is Hector's dolphin at around 4 feet long.
Most dolphins eat fish, squid, and crustaceans. Orcas also hunt seals, sea lions, and even whales. Dolphins often work together in groups to herd fish into tight balls before feeding.
Wild dolphins are generally not dangerous to humans. However, they are wild animals — they can bite and should not be approached or fed. Orcas in the wild have never killed a human, though captive orcas have.
Dolphins have longer snouts, cone-shaped teeth, and curved dorsal fins. Porpoises are smaller, have blunt snouts, spade-shaped teeth, and triangular dorsal fins. Dolphins are also more social and vocal.