According to Marine Life at About.com, walruses are primarily located in sub-Arctic and Arctic waters in the Northern Hemisphere. The Atlantic walrus subspecies lives mainly in the water, on rocky coasts, and on ice near Greenland and northeast Canada. The Pacific subspecies calls United States and Russian waters its home. Walruses' depend heavily on sea ice, which they use for giving birth, nursing, shelter, moulting and travel.
As of 2014, there is concern among experts about sea ice melting due to rising global temperatures, which is causing walruses to retreat to coastal areas. The crowded conditions, lack of food and resources and increased predators are a threat to the walruses' way of living, according to Marine Life at About.com.
Walruses follow a carnivorous diet, feeding mainly on creatures on the ocean floor, including clams, mussels, fish, seals and dead whales. They use their whiskers to sense prey, quickly sucking food into their mouths. Marine Life notes that they have two large tusks, and 16 additional teeth.
The average lifespan of a wild walrus is between 20 and 30 years. When it is not breeding season, walruses form gatherings on rocky beach areas, numbering in the several tens of thousands. Male walruses reach sexual maturity by age 7, but they may not mate until they are 15 years old, explains Marine Life.