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The walrus, scientifically known as *Odobenus rosmarus*, is a marine mammal belonging to the family Odobenidae. It is classified within the order Carnivora, class Mammalia, and phylum Chordata. The species was described by Linnaeus in 1758. Common names for this organism include Morsa, Morse, and Walross. It is viviparous and exhibits a cathemeral diel cycle.

The International Union for Conservation of Nature lists the walrus as Vulnerable, a status recorded in 2025. The animal is a source of walrus ivory. Its gestation period lasts 15 units. The species is referenced by 1,377 other encyclopedia articles.