POPULATION

        Population control can be influenced by a variety of factors. Humans can greatly influence the size of animal populations they directly interact with. It is for example relatively common (and sometimes even a legal requirement) to  spay  or  neuter  dogs. Spaying – removing the ovaries and uterus of a female animal – medical term =  ovariohysterectomy . Neutering - removing the testes of a male animal – medical term =  orchiectomy . Various humans activities (e.g. hunting, farming, fishing, industrialization, and urbanization) all impact various animal