You can occasionally see lizards like this guy (possibly a Brown Anole) in Big Bend. The Persimmon Gap trail follows a wide wash for most of the way, and I guess he wanted in on the action. I cannot imagine what he eats; I did not see anything edible (except him). The eponymous persimmon trees were nowhere to be seen.

Big Bend actually has quite a lot of animal and plant diversity, since the climate ranges from desert to alpine tundra. The animal life is certainly more abundant in the Chisos Basin. I saw lizards, tarantualas, the Mexican Jays, hawks (or perhaps the perigrine falcons), deer, and javalinas (a sort of wild pig) in the Basin. In the desert I only saw the occasional lizards, and in Mule Ears Spring, some frogs and a kind of swimming beetle.