The mating season of this rock iguana begins in May and continues into June, followed by nest digging from the end of June into July, and hatchlings emerge from nest-burrows in September or October (6). Both males and females have been observed mating with multiple partners, and a polygamous mating system is thought likely, although repeat matings with the same partner are also frequently observed (6). As a result of competition for access to females, some males may utilise forced-copulation and mate-guarding (6). Clutch size correlates to female body size, both of which are relatively small compared to other iguanas, and can vary between anything from two to ten eggs, depending on the subspecies and location (6). Nest defence by females appears to vary with nesting density (6), but males seem to be territorial throughout the year (4). Indeed, male Acklin's iguanas (C. r. nuchalis) have been observed chasing other males out of defended areas, and engaging in 'jousting matches' involving open-mouthed territorial displays, and individuals often bear bite-mark-like scars (4). This iguana primarily feeds on plant material of several species, but birds, conspecific hatchlings, the legs of dead land crab, a grasshopper, a hermit crab and insect material have also been recorded in the diet (6).
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