Those measured in Academy Bay average 0.75m. Females average 0.6m. Adult size varies greatly between islands. Males weigh 1.5kg on average. Females weigh 0.5kg on average.
Adult weight varies greatly between islands.
The marine iguana is a herbivore and feeds on red and green marine algae. They are renowned for their unique adaption to feeding underwater in the cold waters of the Humboldt current. The iguanas live in nesting colonies, with breeding commencing in December. Females lay only two to four eggs per year. The hatchlings begin to emerge between May and early July.