Throughout North America wolves are known to have lived at most elevations, from sea level to over 10,000 feet. In the arid Southwest and Northern Mexico, however, wolves were less common at lower elevations and lived primarily in montane areas. Higher elevations generally receive more precipitation, which in turn supports greater biomass of vegetation and thus more deer and other herbivores upon which wolves prey. Though estimates vary, most wildlife biologists agree that somewhere between 3,500 and 4,000 feet is the elevation threshold below which wolves seldom frequented.

This fact begs the question: What percent of the Big Bend Wolf Recovery Area is above and below this elevation threshold?


...and on the map above are the answers.

The steps I took to create this map are as follows: