Charles Darwin set sail on the HMS Beagle around the world, hoping to find more research on certain specimen around the world. Darwin's mission was deemed a success when him and his crew sailed through the Galapagos Islands. There, Darwin was able to observe 13 different species of finches, which were all believed to have come from one dominant ancestor. Darwin organized these finches into groups based on where they lived and what they ate, for example some finches were labeled as insect-eating while others were labeled as tree finches because they lived up in the trees. Ultimately, every finch evolved into its own to better fit it's own environment. Some developed larger, harder beaks to hunt bigger prey while others had smaller beaks to hunt smaller insects. Darwin noticed the variation in traits right away and figured that this result could have only happened through a process he called, Natural Selection. Which is like environment's way of picking and choosing which species gets fit in the best to its surrounding area. This mechanism ultimately paved the way for the theory of evolution or what we now call, gradualism.