Tu Bai says that today's domestic cat has gone through 30,000 to 40,000 years of evolution. The reason that there has been no great change in their morphology is because they all come from a single species (of wild cat).
杜白表示，現在的家貓經過三、四萬年的演化，外型體態卻沒有太大變異，是因為它們都來自單一種（野貓）。