A dolphin is an aquatic mammal in one of the families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the New World river dolphins), Pontoporiidae (the brackish …

Dec 25, 2025 · Mammalian dolphins are any of the toothed whales belonging to the mammal family Delphinidae (oceanic dolphins) or the mammal families Platanistidae and Iniidae (river dolphins). The …

Dolphins are some of the most intelligent marine mammals. Find out more about these aquatic animals and how you can contribute to dolphin conservation.

Dolphins are small-toothed cetaceans easily recognizable by their curved mouths, which give them a permanent “smile.” There are 36 dolphin species, found in every ocean.

Dolphins are marine mammals, together with whales and porpoises they are collectively known as cetaceans. Some dolphins live in rivers and estuaries.

Learn all about dolphins - are they a mammal, whale, or fish, dolphin types, where they live, life span, diet, endangered status, interesting facts, and more.

Depending on the species, dolphins range in color from white, pearl, and pink to darker shades of brown, gray, blue, and black. Dolphins have smooth skin, flippers, and a dorsal fin. They have a long, …

Dec 9, 2025 · Dolphins are highly intelligent, marine mammals known for their complex behavior, global distribution, and remarkable evolutionary history.

Mar 9, 2024 · Six dolphin species are commonly called whales (think killer whales!), and technically, all dolphins are whales because they’re part of the category “toothed whales” in the order Cetacea.

This page includes information on evolutionary theories, taxonomy, differences between dolphins and porpoises, and descriptions of dolphin organs and biological systems.