What is the role of Charles Darwin in relation to concept of species?

Explanation

1. Charles Darwin visited the Galapagos Islands as a naturalist on a five year voyage around South America. He found 13 types of "Mocking birds" on the same island but in different habitats.
2. He brought back the different types and studied them. He found that only the beak pattern and usage was different in these different varieties.
3. This made him think that adaptation to suit a particular habitat (for food) had brought about such changes in these birds which lived in different habitats.
4. After some time they evolved into different species. The formation of new species or 'speciation' is brought about by Natural selection (Nature being the deciding factor).
5. Hence Darwin gets this credit of attempting to explain how species evolved and role of Natural selection. The birds are referred to as Darwin's finches. In 1859 Charles Darwin in his book Origin of Species explains the evolutionary connection of species by the process of natural selection.