We soon caught our first glimpse of a marine iguana, certainly among the most unusual creatures in the Galapagos. Charles Darwin made extensive observations on these large, lizard-like reptiles. They certainly well demonstrate the unique evolution and adaptation of Galapagos fauna, developing into efficient swimmers feeding off shore mostly on marine algae and seaweed. A gland connected to the notrils removes salt from the body, which is then expelled by sneezing. The spray often shoots up into the air and then falls back on the head, where it forms the white wig often seen on marine iguanas.