Charles Darwin was appointed naturalist aboard the H.M.S. Beagle, which left England in 1831 to map the coast of South America and then circumnavigate the globe. As Darwin explored, he came to dispute the idea that catastrophic upheaval created mountains and shaped the earth - and if geological change came slowly, could not living species also evolve the same way? As his journey continued to the Galapagos Islands, New Zealand, and Australia, his theories crystallized. Returning to England in 1836, he published his journal. It became an immediate best seller and a classic of natural history. Download and start listening now!