In the last decades, Beavers were silently and illegally released in Europe and Southamerica (were they are a pest now). I would not discard a similar pattern here. They are physically blocked by arid land (Can only travel near water courses and die if they are forced to stay out of the water for many days).<p>Is proven than its presence protects against wildfire, creates biodiversity, and fix small patches of life in desertic places suffering from dry spells so, can be an opportunity to heal the area. The photos of arid places before and after beavers appear show impressive changes in the beavers territory.<p><a href="http://southlandbeaver.blogspot.com/2014/09/the-mojave-river-beaver.html" rel="nofollow">http://southlandbeaver.blogspot.com/2014/09/the-mojave-river...</a>