One of my favorite animals on the Galapagos was the marine iguana. They're smelly, gross (they rocket salt water out of their nostrils), and prehistoric looking, but so amazing! We got to swim with them in the ocean and see piles of them on land. This one had a little buddy perched atop his head.
Want to see marine iguanas? Check out Lindblad Expeditions Galapagos cruises.