When those prehistoric species died out, new ones replaced them, including the ancestors of these elk, which now run free on the Niobrara National Wildlife Refuge in northern Nebraska.

当这些史前物种灭绝时，新物种取代了它们，包括这些麋鹿的祖先，它们现在在内布拉斯加州北部的 Niobrara国家野生动物保护区自由奔跑。