These creatures developed other ways to thrive comfortably . a few animals , such as the sphynx cat below and the mexican hairless dog at left , are practically hairless because people bred them that way . they ' re bred as pets 一些无毛动物，如加拿大无毛猫和墨西哥无毛犬等，由于人们将其作为宠物饲养，并让它们一直按照这种样子繁殖下去，所以它们身上几乎连一点毛都没有。
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