July 21, 2012; Hayden Valley, Yellowstone National Park.From Wikipedia:
The grizzly bear (Ursus arctos horribilis)
, also known as the silvertip bear
, the grizzly
, or the North American brown bear
, is a subspecies
of brown bear (Ursus arctos)
that generally lives in the uplands of western North America. This subspecies is thought to descend from Ussuri brown bears
which crossed to Alaska
from eastern Russia
100,000 years ago, though they did not move south until 13,000 years ago.
Except for cubs and females,
grizzlies are normally solitary, active animals, but in coastal
areas, the grizzly congregates alongside streams
, and ponds during the salmon spawn
. Every other year, females (sows) produce one to four young (commonly two) which are small and weigh only about 500 grams (1 lb). A sow is protective of her offspring and will attack if she thinks she or her cubs are threatened.