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Unexpected modifications in our appearance associated with animals, including unusual size, scabies, poo tail or even other characteristic features, are the result of genetic mutation that occur at all times naturally. Mutations that people like are then tried to keep to the greatest degree possible. Lyons explains that each animal has a defined “basic plan of the physical body structure, and when a mutation happens, people choose those who are their particular favorite”. The introduction of most feline breeds has been accelerating only in the past 75 years, and dog breeds happen to be developing for hundreds of years, as confirmed by Elaine Ostrander, chief researcher at the Department of Cancer Comparative and Genetics Genomics at the National Institute of Health ).