I realize the point is moot now, but my own Google search for pain causing a fever led me to multiple answers of NO, and I know from my own medical issues that it is untrue, fever can be a rather rare response of the body to pain.
Harvester ants are the staple food source for most types of Horned Lizards or (horn toads). They provide formic acid - a necessary nutrient for horned lizards. A typical horned lizard adult may eat from 20 - 100 harvester ants a day. However, most pet stores do not supply harvester ants as feeders for horned lizards.
Gut-loaded crickets can make up the majority of the diet; however, variety is the spice of life, and the more you can vary a toadâs diet, the better off it will be. During warm months, catching local insects (nontoxic, of course) can provide added variety.