Abstract
Abstract Females of some lizard species exhibit conspicuous coloration during the breeding cycle (“nuptial coloration”) that elicits male courtship. We conducted two field experiments with San Cristobal Lava Lizards (Microlophus bivittatus) in the Galapagos Islands to determine how the presence and extent of nuptial coloration on lizard robots affected responses of adult males and females. Robots programmed to perform conspecific bobbing displays had a morphological appearance that mimicked (1) a conspecific female without nuptial coloration (non-red control stimulus); (2) a conspecific female with nuptial coloration (normal red stimulus); or (3) a female with an extent of nuptial coloration beyond the range of conspecific variation (super-normal red stimulus). In Experiment 1, subjects witnessed two stimuli in sequence, being presented first with the side of a robot that exhibited conspecific nuptial coloration or with the opposite side of the same robot that lacked nuptial coloration. Results showed no ...
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