In his notes, Darwin referred to marine iguana’s with relative revulsion. “The black Lava rocks on the beach are frequented by large (2-3 ft), 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.”
The cold-blooded reptiles are the only lizard that has evolved the ability to live and forage in the sea.