In spite of their massive size, these bears can run at speeds of up to
40 km
per hour (25 miles per hour). Every other year, the females (snows) produce one to four young (most commonly two) which are small and weigh only about 500 grams (one pound). A sow is very protective of her offsprings and will attack if she is being threatened.
Male grizzly bears can range from weights of 180 to 680 kilograms (400 – 1,500) and stand 2,44 meters (8ft) tall on their hind legs; the females are smaller. Their coloring ranges widely across geographic areas, from blond to deep brown or red. These differences, primarily due to the different environments, particularly, with regard to diet and temperature.