From Captain's Point you can see the island of Monito, about two miles westward. It is uninhabited except for temporary nesting colonies of birds, and an endemic species of gecko. it has no beaches and access is very tricky - you have to approach in a rowboat and wait until a swell lifts you up to a certain ledge that you can grab onto and haul yourself up.
Near Pajaros Beach, located on the southeastern coast, you can find the ruins of a guano-mining operation that existed in the 1930's, run by some Dutch settlers. They briefly inhabited the island to mine the extensive guano deposits in the caves located on the eastern coast; they brought with them goats and pigs as food. These animals are now well-established on Mona; they pose a dire threat to the ecosystem there because the goats compete for the vegetation that the native iguanas eat and the pigs dig up the iguanas nests and eat the eggs and hatchlings. There is a limited hunting season on Mona, established in an effort to eradicate the population of feral goats and pigs.
At Pajaros Beach there is a large concentration of rhinoceros iguanas, a subspecies found nowhere else on earth. They eat almost anything, given the sparse, xerophytic vegetation, but have learned to take advantage of the refuse left behind by careless campers. They make their burrows in the sand, close to or underneath the rock formations that lead up to the beach:
This subspecies of rock iguana, Cyclura cornuta stejnegeri, has one large "horn" in between its nostrils, and two smaller protuberances slightly to the front and on either side of the "horn":
