Nature’s Great Events| BBC Earth
The grizzly bear, also known as the North American brown bear or simply grizzly, is a population or subspecies of the brown bear inhabiting North America. In addition to the mainland grizzly, other morphological forms of brown bear in North America are sometimes identified as grizzly bears.
Bears are apex predators and influence their ecosystems through predator-prey relationships. Likewise, salmon “feed” the ecosystem not only by feeding bears, but also with the nutrients their carcases provide to streams and riparian vegetation. Wikipedia