"It is a complete mystery," said Marc Bekoff, a University of Colorado professor who specialises in animal behaviour.
“这完全让人费解”，科罗拉多大学教授、动物行为研究专家马克·贝科夫说道。
"That is a clear difference between dogs and wolves, " says Marc Bekoff, a cognitive ethologist at the University of Colorado, Boulder.
博尔德市科罗拉多大学的认知动物行为学家马克•贝科夫认为“这是狗和狼的明显区别。”
Marc Bekoff, author of The Emotional Lives of Animals, Animals Matter, Animals at Play, and Wild Justice: The Moral Lives of Animals (with Jessica Pierce).
马克·哈特·考夫，动物的感情生活，动物的重要性，玩耍中的动物，野生正义：动物的道德生活(与杰西卡·皮尔斯合作)的作者。
Marc Bekoff, author of The Emotional Lives of Animals, Animals Matter, Animals at Play, and Wild Justice: The Moral Lives of Animals (with Jessica Pierce).
马克·哈特·考夫，动物的感情生活，动物的重要性，玩耍中的动物，野生正义：动物的道德生活(与杰西卡·皮尔斯合作)的作者。
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