Sky Islands are a unique environmental zone all to themselves. Animals evolve within the specialized climate of a high mountain area and are separated from any other mountain top by the desert below. The animals can only exist in that climate. They cannot descend into the desert below nor cross to another Mountain top so over time they evolve into separate species. This environmental difference is because for each 1,000 foot gain in elevation, the temperatures decline three degrees. The Mountains also intercept the clouds causing more rainfall than on the surfaces below. Therefore there are no other collections of animals like them anywhere in the world. Well worth protecting and studying.
According to the Book Continental Divide “Private individuals, non-profits, and borderland governments are piecing together a workable eco-system for mountain lions, bighorn sheep, mule deer, black bear and many other species that have historically roamed the sky islands and flatlands of the Chihauahuan Desert.” Yet we have passed laws that provide for building the wall without thought for environmental issues. All the money and hard work of years for an environment that can never be replaced for an ineffective way to stop illegal passage. How I want to go see them before they are gone and maybe do some little thing toward their protection.