Quick Facts About Wolves
26–36 inches high at the shoulder; 4–6 feet long from nose to tail tip
Males weigh 100–130 pounds; females weigh 80–110 pounds
Average lifespan is about 5 years in wild; can live up to 12 years in wild
Three color phases: gray, black, and white; gray is the most common; white is usually in the high Arctic; and black is common only in the Rockies
400–450 wolves in the Greater Yellowstone Ecosystem
Prey primarily on hoofed animals. In Yellowstone, 90% of their winter diet is elk; more deer in summer; also eat a variety of smaller mammals like beavers
Mate in February; give birth to average of five pups in April after a gestation period of 63 days; young emerge from den at 10–14 days; pack remains at the den for 3–10 weeks unless disturbed.
via Wolves in Yellowstone – Yellowstone National Park (U.S. National Park Service).