It can be a variety of colors based on the kind of seaweed it eats.
It typically dives for five minutes at a time.
It has special glands to remove and collect the salt from the saltwater. The salt gathers in its nose so it can sneeze the salt out.
When Darwin was in the Galápagos, he was intrigued by these creatures. He was curious to know if they liked the water and could swim so he threw iguanas into the ocean. But the iguanas only went into the water to feed, so they climbed out and back to land. Darwin picked them up and threw them in the ocean again.