28 The black lava rocks on the beach are frequented by large (2-3ft) most disgusting, clumsy Lizards. They are as black as the porous rocks over which they crawl & seek their prey from the Sea. Somebody calls them imps of darkness. They assuredly well become the land they inhabit. Charles Darwin, 17th September 1835, Galápagos Islands Marine Iguana, Galápagos