"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。”
"It's very important" to do studies like these "on socialized wolves, " adds Adam Miklosi, a cognitive ethologist at Eötvös Loránd University in Budapest.