walrus

Walruses mate in the water and give birth on land or ice floes. They feed in the water, diving to depths of 300 ft (91 m), sometimes staying under for as long as a half hour. Clams and mollusks form a large part of their diet. Male walruses compete for territory, often fighting each other; the winners in these fights breeds with large numbers of females. Older male walruses are frequently seen with large scars from these battles, which are bloody but rarely fatal.
Pacific walruses spend the summer north of the Bering Strait in the Chukchi Sea along the north shore of eastern Siberia, around Wrangel Island, in the Beaufort Sea along the north shore of Alaska, and in the waters between those locations.
Smaller numbers of males summer in the Gulf of Anadyr on the south shore of the Chukchi Peninsula of Siberia and in Bristol Bay off the south shore of southern Alaska west of the Kenai Peninsula.
In the spring and fall they congregate in the Bering Strait, adjacent to the west shores of Alaska, and in the Gulf of Anadyr. They winter to the south in the Bering Sea along the eastern shore of Siberia south to the northern part of the Kamchatka Peninsula, and along the southern shore of Alaska.
The breeding season for walruses is midwinter, a time spent in the southern Bering sea. The males show off in the water for the females who view them from pack ice. Males compete aggressively for this display space with each other. Mating is probably in the water. After fertilization the fertilized egg is dormant for several months, then a gestation period of 11 months follows. When a calf is born it is over 3 ft (1 m) long and able to swim. Birth takes place on the pack ice; the calf nurses for about 2 years, spending 3 to 5 years with its mother. Females are mature at about 6 years, males at 9 or 10. A walrus lives about 40 years.