Evolution

Evolution is the concept that over a period of generations, a lifeform's population will change its shape in response to genes that are allowed to survive. Typically a gene might survive thanks to its expression allowing a further chance at survival and reproduction: a new trait that allows an animal to not get eaten and/or eat more and reproduce more is a trait that is likely to be passed onto its offspring, because it can have offspring. However, there are also many traits that don't necessarily prohibit survival and reproduction and also get passed on.
Evolution was first formulated by a series of scientists, with the most credit being given to Charles Darwin. Throughout time though some people have wondered if animals changed from long passed ancestors. Domestication relies on the theory of evolution in that by breeding specific traits in wild animals, you eventually get something that looks and acts completely different. Most commonly this is presented as the case with wolves and dogs, as dogs have the most dramatic differences from their ancestors to that of any other domesticated animal group.
Evolution is not always believed as it often contrasts with creationist views. In the United States, this is most often thought to be Christianity. This is in part because of Christianity's high status of influence and popularity in that country. Therefore, a lot of U.S citizens are Christian, and a lot of those churches preach creationist views (but not all). However, there are many other religions that exclude evolution. Most ancient or orthodox forms of religions reject it, including Judaism, Paganism, and Islam. Some modern religions such as New Ageism and Falun Dafa may also reject it. However different sects or individuals may believe in evolution. There are many Christians, Judaists, Muslims, Pagans, and New Ageists that believe in evolution. It is said that most, if not all, of science as a practice accepts evolution not as a "theoretical concept" but as truth. Thus when I categorize animals on this wiki, I do include their evolutionary details and scientific nomenclature as relevant.