Fernandina is one of the most pristine islands in the world because it does not contain any introduced mammal species. The island itself is a shield volcano and lava fields dominate the island’s landscape. The main attraction of Fernandina Island is the world’s largest colony of marine iguanas but you can also observe sea lions, shore birds and the unique flightless cormorants. If you are lucky, you might even stumble upon some penguins.