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Dolphins in captivity, spend only 20% of their time under the surface contrasting with the dolphins in the wild that can be up to 80%. Activities like beaching themselves in aquatic shows are against their nature because the dolphins in the wild would never beach themselves.
As mammals, they have warm blood and nurse their young. Dolphins have more than one mate, and generally produce a single offspring that will stay with the mother for up to six years, depending on ...
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All dolphins have conical-shaped teeth. A Risso's dolphin has 14 while a spinner dolphin can have 240. The orca (killer whale) is the largest dolphin. Hector's dolphin and Franciscana are two of the smallest. The five river dolphin species inhabit the large waterways of Asia and South America.
13 de dic. de 2019 · Laura Klappenbach. Updated on December 13, 2019. Dolphins ( Odontoceti) are a group of 44 species of toothed whales or cetaceans. There are dolphins in every ocean on Earth, and there are freshwater species of dolphins that inhabit rivers in South Asian and South American.
- 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) 37 species in 17 genera found worldwide, some of which occasionally venture into fresh water.
•Genus Lagenorhynchus (white-sided and white-beaked dolphins) 6 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) 5 species found worldwide in tropical to warm temperate waters.
- The Editors of Encyclopaedia Britannica
Dolphin Facts. Dolphins are incredibly intelligent, social, wide-ranging and deep-diving marine mammals. They live in complex social groups called pods, often made up of family members. In the wild, dolphins are very interconnected to the health and survival of the entire marine ecosystem.
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).
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