found C. nubila sensu lato to be monophyletic, Burton claimed lewisi could be separated from the other two taxa without rendering C. nubila polyphyletic. Although none of this might be used to traditionally delineate a population as a species, he proposed using the "general lineage concept" introduced by de Queiroz in 1998 to do so anyway. Common names This animal was originally called the Grand Cayman rock iguana, or Grand Cayman blue rock iguana. After separating this population taxonomically from the other Cayman Islands rock iguanas, Burton proposed a set of new vernacular names for the population in 2004: Grand Cayman blue iguana, Cayman blue iguana or for local colloquial use he proposed the simple abbreviated blue iguana. Note that the name "blue iguana" is also used for bright blue forms of the green iguana, Iguana iguana. Description An example of island gigantism, the blue iguana is the largest native land animal on Grand Cayman with a total nose-to-tail length of and weighing as much as . This is among the largest species of lizards in the Western Hemisphere. The largest of the Cyclura, its body length is with a tail equal in length. The blue iguana's toes are articulated to be efficient in digging and climbing trees. The mature male's skin color ranges from dark grey to turquoise blue, whereas the female is more olive green to pale blue. Young animals tend to be uniformly dark brown or green with faint darker banding. When they first emerge from the nest the neonates have an intricate pattern of eight dark dorsal chevrons from the crest of their necks to their pelvic area. These markings fade by the time the animal is one year old, changing to mottled gray and cream and eventually giving way to blue as adults. The adult blue iguana is typically dark gray matching the karst rock of its landscape. The animal changes its color to blue when it is in the presence of other iguanas to signal and establish territory. The blue color is more pronounced in males of the species. Their distinctive black feet stand in contrast to their lighter overall body color. The blue iguana's eyes have a golden iris and red sclera. Blue iguanas are sexually dimorphic; males are larger and have more prominent dorsal crests as well as larger femoral pores on their thighs, which are used to release pheromones. The male