They can trot for hours, easily covering 50 miles a day. And they can reach speeds of 40 miles per hour. Wolves also have a superior sensory mechanism. Their hearing is acute and their vision detects movement long before human eyes. Their nose makes them very efficient predators and helps them decipher the differences between strong, healthy animals and weak vulnerable prey.
Wolves feed on large animals such as moose, deer, elk, caribou, bison, and musk oxen.
Pray animals are not defenseless. These large animals can be four times larger than a wolf and capable of fracturing wolves' bones during a fight. Consequently, wolves are very selective with their prey. If the prey appears healthy and fit, the wolves abandon the chase and search for a weaker target. This pursuit of the weaker animals is one reason wolves help improve the health of animal populations.