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The narwhal was scientifically described by Carl Linnaeus in his 1758 publication Systema Naturae. [5] The word "narwhal" comes from the Old Norse nárhval, meaning 'corpse-whale', which possibly refers to the animal's grey, mottled skin and its habit of remaining motionless when at the water's surface, a behaviour known as "logging" that usually happens in the summer.
Surface-living animals (such as sea otters) need the opposite, and free-swimming animals living in open waters (such as dolphins) need to be neutrally buoyant in order to be able to swim up and down the water column. Typically, thick and dense bone is found in bottom feeders and low bone density is associated with mammals living in deep water.
Additional file 2 Crittercam AVI footage of the upside-down swimming behaviour along the bottom of a group of narwhals for internet version of the article (Narwhal upside-down swimming bottom.avi). Software used: Xiph.Org libtheora 1.1 20090822 (Thusnelda) Xiph.Org libVorbis I 20101101 (Schaufenugget) Date and time of digitizing: 2007-11-19
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Crittercam footage of a narwhal swimming upside-down under the ice within a group of conspecifics. Footage of an American alligator swallowing prey it just captured. Crittercam is a small package of instruments including a camera that can be attached to a wild animal to study its behavior in the wild. National Geographic's Crittercam is a ...
Beluga and Narwhal are native to coastal regions and pack ice around the Arctic Ocean. Both species are relatively small whales, 3–5 m (9.8–16.4 ft) in length, with a forehead melon , and a short or absent snout.
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The physiology of underwater diving is the physiological adaptations to diving of air-breathing vertebrates that have returned to the ocean from terrestrial lineages. They are a diverse group that include sea snakes, sea turtles, the marine iguana, saltwater crocodiles, penguins, pinnipeds, cetaceans, sea otters, manatees and dugongs.