To zero in on possible human influence on the domestic cat,Nicastro went to a zoo in Pretoria,South Africa,and recorded the calls of wild desert cats (the animals thought to be the ancestors of domestic cats).

• 为了专心于研究人类对家猫的影响，尼卡斯特罗去了南非的比勒陀利亚的一个动物园，并已录下了沙漠野猫(这种动物据说是家猫的祖先)的叫声。