 Longevity in the wild is unknown but is presumed to be many decades . A blue iguana named " Godzilla " captured on Grand Cayman in 1950 by naturalist Ira Thompson was imported to the United States in 1985 by Ramon Noegel and sold to reptile importer and breeder , Tom Crutchfield in 1990 . Crutchfield donated Godzilla to the Gladys Porter Zoo in Brownsville , Texas in 1997 and the lizard remained there until its death in 2004 . Thompson estimated Godzilla to be 15 years of age at the time of his capture . At an estimated 69 years of age ( 54 of which were spent in captivity ) , Godzilla may be the world 's longest @-@ living lizard for which there is reliable record . A closely related Lesser Caymans iguana ( C. nubila caymanensis ) has been documented as living 33 years in captivity . 
