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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.
Belugas can be found in the far north of the Atlantic and Pacific Oceans; the distribution of narwhals is restricted to the Arctic and Atlantic Oceans. Monodontids have a wide-ranging carnivorous diet, feeding on fish, molluscs, and small crustaceans. They have reduced teeth, with the beluga having numerous simple teeth, and the narwhal having ...
The North American land-mammal-age system was formalized in 1941 as a series of provincial land-mammal ages. [2] The system was the standard for correlations in the terrestrial Cenozoic record of North America and was the source for similar time scales dealing with other continents.
The Marine Mammals of the North-western Coast of North America: Together with an Account of the American Whale-fishery. Dover. ISBN 978-0-486-21976-9. Schmitt, Frederick; Cornelis de Jong; Frank H. Winter (1980). Thomas Welcome Roys: America's Pioneer of Modern Whaling. University Press of Virginia. ISBN 978-0-917376-33-7. Webb, Robert (1988).
Opossums probably diverged from the basic South American marsupials in the late Cretaceous or early Paleocene. They are small to medium-sized marsupials, about the size of a large house cat, with a long snout and prehensile tail. Family: Didelphidae (American opossums) Subfamily: Didelphinae. Virginia opossum, D. virginiana [n 1] [n 2] LC
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This is a list of North American mammals. It includes all mammals currently found in the United States, St. Pierre and Miquelon, Canada, Greenland, Bermuda, Mexico, Central America, and the Caribbean region, whether resident or as migrants. This article does not include species found only in captivity.
Skull of a cross between a narwhal and a beluga whale, at the Zoological Museum, Copenhagen. The beluga was first described in 1776 by Peter Simon Pallas. [1] It is a member of the family Monodontidae, which is in turn part of the parvorder Odontoceti (toothed whales). [1]