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Is a dolphin a mammal?
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Did Dolphins exist in the Miocene?
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- Overview
- Natural history
- Conservation status
- Paleontology and classification
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 name dolphin is also applied to members of the fish genus Coryphaena (family Coryphaenidae), also known as mahimahi.
How big can a dolphin grow?
Most dolphins are among the smaller species of toothed whales, measuring less than 3 meters (10 feet) in length.
Do dolphins swim fast?
Dolphins are swift swimmers; the bottlenose dolphin can attain speeds of nearly 30 km/hr (18.5 mph) in short bursts, and common dolphins are even faster.
What are dolphins known for?
Dolphins can live in either fresh or salt water. Distributed in marine environments worldwide, they range from equatorial to subpolar waters and also can be found in many major river systems. The common and bottlenose dolphins are widely distributed in warm and temperate seas. They are swift swimmers; the bottlenose can attain speeds of nearly 30 k...
Information regarding current population levels and trends remains elusive for many dolphin species. Although bottlenose dolphins are species of least concern, according to the International Union for Conservation of Nature (IUCN), several dolphins are at risk of extinction. Dolphin species that the IUCN considers vulnerable or near threatened incl...
Dolphins first appear as fossils from the Early Miocene Epoch (23 million to 16 million years ago)—a time when the cetacean fauna was more diverse. All of today’s dolphin groups were present in the Miocene, as were at least three extinct families whose members would be called dolphins (Eurhinodelphidae, Hemisyntrachelidae, and Acrodelphidae).
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•Family Delphinidae (oceanic, or marine, dolphins)\t37 species in 17 genera found worldwide, some of which occasionally venture into fresh water.
•Genus Lagenorhynchus (white-sided and white-beaked dolphins)\t6 species found in subpolar to temperate waters of the Northern Hemisphere and polar to temperate waters of the Southern Hemisphere.
•Genus Stenella (spinner, spotted, and striped dolphins)\t5 species found worldwide in tropical to warm temperate waters.
- The Editors of Encyclopaedia Britannica
There are currently 42 species of dolphins and seven species of porpoises. Dolphins are marine mammals. They must surface to breathe air and give birth to live young. A dolphin pregnancy last between nine and 16 months. The mother feeds her offspring on milk.
A dolphin is an aquatic mammal within the infraorder Cetacea. Dolphin species belong to the families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins ), Iniidae (the New World river dolphins), Pontoporiidae (the brackish dolphins), and possibly extinct Lipotidae (baiji or Chinese river dolphin).
Most dolphins are marine and live in the ocean or brackish waters along coastlines. There are a few species, however, like the South Asian river dolphin and the Amazon river dolphin, or boto ...
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