Why are thorny devil lizards called devil?
Thorny devils are unusual lizards, covered all over with sharp thorn-like protuberances. They are not the sort of lizard one is encouraged to pick up - hence the name, devil. They are best avoided.
There is no such creature as an "American Thorny Devil". Thorny devils are native to Australia. The only North American lizards even distantly related are the horned lizards belonging to the genus Phrynosoma. Thorny devils do not shoot blood out of their eyes. The Texas Horned lizard, Coast horned lizard, and at least two other species, none of which are Thorny devils, will shoot blood from their eyes as a defence mechanism.
Now that would depend on what your interpretation of a predator is Now to an Ant, an lizard called the thorny devil would be a major predator as that all thorny devils eat...ants! But to us or anything bigger they aren't much of a threat, the poor thorny devil is usually the prey Your main predators would be the larger lizards or monitors, dingos (Introduced approx 2500years ago) raptors and snakes