There are less than 300 whooping cranes in the last, self-sustaining wild flock.
Sandhill cranes may migrate as far as 5,000 miles each spring and autumn.
Flying at 47mph, whooping cranes can migrate 200 to 500 miles per day.
The whooping crane is the tallest flying North American bird.
More than 500,000 sandhill cranes stop along the Platte during spring migration.