Abstract
Potential sexual dimorphism of several aspects of antipredatory behavior by the Keeled Earless Lizard (Holbrookia propinqua) was studied by simulating approach by a predator. Females stayed closer to cover suitable for use as refuges than males, but no sex differences were detected in the distance between predator and prey when escape was initiated, the distance fled, or the tendency to enter refuges. Despite the sex difference in distance to cover, the regressions of flight initiation distance and distance fled on distance to cover were monomorphic. The sexes fled similar mean distances even though females were closer to refuges because some lizards stopped short of refuges and others fled past them. No differences in antipredatory behavior were noted between bright and plain female color phases.
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