According to PBS, when an average grizzly bear is on all fours, it is about 3.5 feet in height. However, when it rears up on its hind legs, a grizzly can stand between 6 and 7 feet tall.
Grizzly bears are a type of North American brown bear. Males tend to be larger, weighing between 300 and 850 pounds, and females are typically smaller, weighing around 200 to 450 pounds. Despite their size, they are capable of reaching speeds of up to 35 miles per hour. Since bears are omnivores, eating both plants and animals, they sometimes run after food such as rodents, mountain sheep, caribou, elk and moose. In addition, they eat a wide variety of vegetation, including grasses, berries, mosses, roots, nuts and fruits.