 Columbus had found the two smaller sister islands (Cayman Brac and Little Cayman) and it was these two islands that he named "Las Tortugas".The 1523 "Turin map" of the islands was the first to refer to them as "Los Lagartos", meaning alligators or large lizards, By 1530 they were known as the Caymanes after the Carib word "caimán" for the marine crocodile, either the American or the Cuban crocodile, "Crocodylus acutus" or "C. rhombifer", which also lived there.Recent sub-fossil findings suggest that "C. rhombifer", a freshwater species, were prevalent until the 20th century.