The famous naturalist Charles Darwin presented the theory of natural selection. He went on many journeys on sea and on land, following his interests of the nature and the change that happens in the nature, i.e., the change in species. Following his exposure to many different kinds of birds, insects and animals, he explained Natural Selection as "presentation of favorable variations and the rejecting of injurious variations."(131). Darwin used analogies and metaphors to demonstrate that different alterations occurred in the same specie, which helped them to adapt to their surroundings.