A Galápagos marine iguana poses on a rock. It has darker scales than some of its cousins on other islands, reflecting how this species has evolved in different ways to suit the many environments of the Galápagos.
Marine iguanas are the only lizard in the world that’s adapted for swimming. Naturalists theorize that they all descend from common ancestors who drifted away from the mainland on floating logs.
Stock Image #20200224-07275837