On December 27, 1831, the HMS Beagle launched its voyage around the world with Darwin in tow. Over the course of the trip, Darwin collected a variety of natural specimens, including birds, plants and fossils. Through hands-on research and experimentation, he had the unique opportunity to closely observe principles of botany, geology and zoology. The Pacific Islands and Galapagos Archipelago were of particular interest to Darwin, as was South America.