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Sexual dimorphism (SD) is a common trait in animals, appearing due to sexual selection, fecundity selection or natural selection promoting sexual niche segregation. To evaluate the relative contribution of these mechanisms in shaping phenotypic patterns, we explored morphological and functional SD in the Moorish gecko, Tarentola mauritanica (Linnaeus, 1758). This species is particularly interesting because the sex of individuals is determined by the incubation temperature of the eggs, which may pose constraints on the expression of SD. Our results indicate the existence of marked SD in T. mauritanica. Males were overall larger than females, and were able to bite harder, but we found no differences between the sexes in climbing capacities. When differences in body size were taken into account, SD became less pronounced, appearing only in relative head dimensions, relative hind limb length and bite …