algal-forager amblyrhynchus-cristatus black color colored colors colour coloured colours crest-of-spines forage forager graceful-swimmer heat-absorption Iguana large lethargic lethargy lizard long-sharp-claws marine-iguana marine-reptile reptile reptilian salt salty sea spikes spiky spiky-dorsal-fin subtidal-algae-forager sun-absorption Sunbather amblyrhynchus America amphibian animal backgrounds bright Camouflage Chameleon close-up closeup dark day dragon endangered endemic eye eyes Galapagos green head image island islands light looking monster nature ocean outdoors park pet portrait pose rock scary scene skin stone texture travel tropical water wild wildlife zoo