Thought to be at least 3,9 million years old, Santa Fe, also called Barrington Island after British Admiral Samuel Barrington, is one of the oldest islands in Galapagos. Covered by a thick forest of giant prickly pear cactae (unique to Santa Fe), this small, uninhabited island is home to many endemic species, including Santa Fe land iguana, Santa Fe mockingbird, Santa Fe rice rat and Santa Fe lava-lizard.