猛犸是在上一次冰期末灭绝的,其中部分原因可能是因为它们无法找到足够的盐。美国密执安州立大学的研究者在距底特律不远的一座盐矿周围发现203处猛犸化石,有力地证实这种巨兽当时急需盐的困境。当10,000年前冰川从北美洲大部分地区消退时,冰雪中夹裹的泥土和碎石遗留下来,将地面盐层覆盖了。今天的非洲象常常长途跋涉寻找可食盐,有时还 Mammoths were extinct at the end of the last ice age, partly because they could not find enough salt. Researchers at Michigan State University discovered 203 mammoth fossils around a salt mine not far from Detroit, strongly confirming the beleaguered need for salt at this time. When the glacier subsided most of North America 10,000 years ago, the earth and gravel trapped in ice and snow left behind and covered the ground salt. Today’s African elephants often trek to search for salt, and sometimes also