1897  There are four species of bear in the region. These are the grizzly, brown, black, and small kind called the "silver-tip." The latter are of a gray color and are very fierce.
1922  The large silver tip grizzly in the Rockies, however, is as a rule always ready to attack.
1957  That was the trouble with a silver tip; the awful beast would attack anybody anytime. . . .
1960  This is the country of the silvertip grizzly and the gigantic lobo wolf, vicious 200 pound animals who pack together for the kill.