Northern smooth dolphin
| Northern smooth dolphin | ||||||||||||
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Northern smooth dolphin ( Lissodelphis borealis ) |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Lissodelphis borealis | ||||||||||||
| ( Peale , 1848) |
The northern smooth dolphin ( Lissodelphis borealis ) is one of the two representatives of the genus Lissodelphis within the dolphins (Delphinidae). It is at home in the open seas of the North Pacific (between the 30th and 51st parallel).
features
The smooth dolphin differs from all other dolphin species in the complete absence of the fin . They are very slender, about two to three meters long dolphins. The weight is between 60 and 100 kilograms. The body is black, only the tip of the lower jaw, the chest and a strip from this to the fluke , which widens around the navel, especially in males, as well as most of the fluke underside are white. The muzzle is short and slender with a protruding lower jaw and is set off from the slightly sloping forehead by a furrow. The head is narrow. The pinball machines are small and slim. The fluke is narrow with a concave rear edge and a clear indentation in the middle. Calves are 80 to 100 centimeters long at birth and gray-brown or cream-colored.
behavior
The northern right dolphin usually occurs in groups of five to 200 animals, which sometimes form schools with up to 3000 animals. The animals are jumpy and avoid boats. When swimming fast or on the run, they often make long shallow jumps. Fish and squids serve as food.
literature
- Mark Carwardine : Whales and Dolphins . Delius Klasing, Bielefeld 2008, ISBN 978-3-7688-2473-6 , p. 168-169 .
Web links
- Lissodelphis borealis inthe IUCN 2013 Red List of Threatened Species . Posted by: Hammond, PS, Bearzi, G., Bjørge, A., Forney, KA, Karkzmarski, L., Kasuya, T., Perrin, WF, Scott, MD, Wang, JY, Wells, RS & Wilson, B ., 2008. Retrieved December 29, 2013.