Pronghorn undertake the longest terrestrial migration in the continental United States and face growing obstacles to completing their seasonal movements.
Blocked migration routes cause pronghorn to starve in winter habitat that cannot support their needs or exhaust themselves attempting to breach barriers. Individual animals that fail to complete migration may survive a single year but lose the body condition needed for successful reproduction. Fence modification programs that raise bottom wires cost relatively little per animal benefited and can be implemented across vast landscapes rapidly. Protection of corridor land from development is the long-term solution to migration integrity.