英语学习｜科学美国人｜人类和狼成为朋友

Unlike humans, wolves can subsist on protein alone for months—so scientists say we may have lobbed leaner leftovers their way. Christopher Intagliata reports. How did dogs become humans’ best friend? Well, one idea is that docile wolves flocked to waste dumps near human camps. But there are problems with that idea. “Because why would humans tolerate such a dangerous carnivore close to their camp