 In southern countries of their range, such as Peru, green iguanas appear bluish in colour with bold blue markings.On islands such as Bonaire, Curaçao, Aruba, and Grenada, a green iguana's colour may range from green to lavender, black, and even reddish brown.Green iguanas from the western region of Costa Rica are red, and animals of the northern ranges, such as Mexico, appear orange.