Abstract
sponse to attacks by greater roadrunners, Geococcyx californianus (Sherbrooke, 1990a) or southern grasshopper mice, Onychomys torridus (Sherbrooke, 1991). Although the specific effect of blood squirting by Phrynosoma remains undocumented, stimuli eliciting the behavior suggest an antipredator defense (Middendorf and Sherbrooke, 1992). Anecdotal observations reported in the literature (Holder, 1901; Reeve, 1952), along with our own observations (dog; kit fox, Vulpes macrotis), suggest that it is not the act of squirting, but some component in the blood itself that serves this deterrent
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