this is an adult black spiny-tailed iguana

animal wildlife reptile lizard soil nature ctenosaura similis species iguanidae family common black spiny-tailed iguana native mexico central america colombian islands caribbean sea pacific ocean grasslands forests distinctive keeled scales long tails coloration varies individuals population adults whitish gray color well-defined dark dorsal bands ventral diurnal fast speed predators lash bite cornered guinness book world records lists world's fastest maximal sprint shores lake petén itzá cerro cahuí protected biotope northern guatemala adult