Sexual maturity in walruses occurs at the age of 5 years. A female usually gives birth to a single calf once every three to four years. Pregnancy lasts one year.
Walrus keep herds, occupy coastal areas, forming huge rookeries.
Atlantic walrus was almost exterminated as a result of uncontrolled commercial fishing, and its population is much lower. It is not easy to accurately estimate the number at present, but it probably does not exceed 20 thousand individuals. This population is widespread from Arctic Canada, Greenland, Spitsbergen, as well as in the western region of the Russian Arctic. Based on the enormous geographic distribution and movement data, eight subpopulations of the Atlantic walrus are expected, five in the west and three in the east of Greenland.
The Atlantic walrus used to occupy the limits stretching to the south of Cape Cod, and met in large numbers in the Gulf of St. Lawrence. In April 2006, the northwestern population of the Atlantic walrus was listed as Canadian Species at Risk Act (Quebec, New Brunswick, Nova Scotia, Newfoundland and Labrador) as almost disappeared in Canada.