In response to skummyskull's question, these are my top 5 favorite iguanas because it took way too long trying to narrow down my top 5 reptiles in general! x_x First is the St. Lucian iguana. It is debated whether or not it’s its own species separate from iguana iguana or just a unique coloration found only on the island. All the info I could find about them just said “The St. Lucia Iguana comes from a unique population distinct from other green iguanas. It grows to about 6 ft in length.” It looks pretty unique to me!
Next is the Marine iguana (Amblyrhynchus cristatus). Darwin was revolted by the animals’ appearance, writing:
The black Lava rocks on the beach are frequented by large (2–3 ft [60–90 cm]), disgusting clumsy Lizards. They are as black as the porous rocks over which they crawl & seek their prey from the Sea. I call them ‘imps of darkness’. They assuredly well become the land they inhabit.Next is the beautiful lumpy orange baby, the Galapagos Land Iguana (Conolophus subcristatus). Darwin described these as "ugly animals, of a yellowish orange beneath, and of a brownish-red colour above: from their low facial angle they have a singularly stupid appearance." dang, Darwin.
On South Plaza Island, where the territories of marine iguanas and land iguanas overlap, the two sometimes interbreed, resulting in a hybrid iguana with a mixture of features from each species.
Last is a crested Fiji iguana (brachylophus fasciatus), an adult form that’s very hard to find images of. Many seem to prefer photographing their juvenile stages which show vivid colors from blue to green, but I tend to prefer this darker form of the older individuals. It is one of the few species of iguanas found outside of the New World and one of the most geographically isolated members of the family Iguanidae. The Fijian name for iguana is “vokai”, although some tribes call it “saumuri”. Two tribes regard the iguana as their totem and as such its name is not allowed to be mentioned in the presence of women or the offender may be beaten with a stick.
Populations of these iguanas have been declining over the past century due to habitat destruction, and more significantly, the introduction of mongoose and house cats to the islands.