Big Bend NP Red Spiny Cactus and Chisos Mountains.

"Echinocactus horizonthalonius" is a species of cactus known by several common names, including devilshead, turk's head cactus, blue barrel cactus, eagle's claw, horse maimer, horse crippler, and "visnaga meloncillo". It is native to the southwestern United States and northern Mexico, where it occurs in Chihuahuan Desert and Sonoran Desert habitats, particularly on limestone substrates.