Southern Arizona is interesting country biologically (well, actually it is interesting all kinds of ways). Quite a few Mexican/tropical species make it over the border, especially in the Huachucas or Chiricahuas - thick billed parrots (which centuries ago were as far north as the Verde Valley) and scarlet macaws.

I have excavated a really nice basket at Canyon de Chelly that contained scarlet macaw feathers around a ceremonial ear of corn - traded there from points to the south...