Deer migrations like this epic one in Wyoming haunt our dreams.
National Geographic documented one such huge migration that will amaze you.
These mule deer have a long way to travel during a migration. In western Wyoming these deer will cover 150 miles every year. Now that is a long trek for this deer herd.
What makes the journey even more incredible is the obstacles they encounter. Fences, roads bad terrain and even water hazards lay in front of their path.