Abstract
Abstract This is the first report of antipredator nest defense by iguanian lizards. Female Texas Horned Lizards (Phrynosoma cornutum) and Round-tailed Horned Lizards (P. modestum) consistently exhibited vigorous nest-site defensive behaviors (butting, open-mouth attacks, and biting attacks) when experimentally approached in the field by a potential predator of reptilian eggs, Western Patch-nosed Snakes (Salvadora hexalepis). During both prenesting and postnesting snake trials, such defensive attack behaviors by the female lizards were absent. Females of a viviparous congener, Greater Short-horned Lizards (Phrynosoma hernandesi), failed to exhibit postpartum defensive behaviors to S. hexalepis, and newborns did not associate in proximity to their mothers. Nest-site defense is suggested to be the ancestral behavior in the genus Phrynosoma, and it might have been lost during the evolution of viviparity in certain species. Previous failures to detect nest defense behavior in Phrynosoma, and in related clades ...
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