Ahnost a million years ago, saber tooth tigers, giant sloths and other monsters stumbled into the pits where they were preserved forever in the sticky tar.

• 大约一百万年以前，长着剑齿的老虎、巨大的懒猴和其他庞然大物突然跌进坑内，它们在粘胶似的沥青里被永久保存了下来。