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The Mediterranean gecko, Hemidactylus turcicus, is a nonnative lizard that lives on buildings and other artificial structures in the southern United States. Previous studies have shown that geckos rarely move from one building to another and that, when they do, it is usually due to juveniles dispersing to new buildings. Little is known about the movements of geckos on the buildings they occupy or about the degree to which males and females or adults and juveniles associate with each other during their nocturnal activity periods. We used data from a multi-year, mark-recapture study of a population of Mediterranean geckos on a one-story building in southwestern Louisiana to analyze movements of geckos between recaptures and to analyze age and sex of pairs of geckos. The distance moved by adult geckos between recaptures was usually small (<5 m) regardless of whether the time between recaptures was <30 …