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Unexpected modifications in our appearance of animals, which include unusual size, scabies, poop tail or even other characteristic features, are the result of genetic mutations that occur naturally at all times. Mutations that people like are tried to keep to the greatest extent possible then. Lyons explains that each animal has a defined “basic plan of the body structure, and when the mutation occurs, people select those who are their particular favorite”. The introduction of most feline breeds continues to be accelerating only in the past 75 years, plus dog breeds are actually developing for centuries, as verified by Elaine Ostrander, chief researcher at the Department of Cancer Comparative and Genetics Genomics at the National Institute of Health ).