and giant sloths “could have started digging to protect themselves from a colder and drier climate” during ice ages. Ground sloths might also have used the caves to hide offspring from predators.

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The fact that the last Ice Age resulted in rising sea levels was a lucky break. These caves essentially became the perfect low-oxygen environments for bone preservation. “Typically as a paleontologist ...

Heavy snow bursts, occasionally poor travel visibility, gusty winds to impact the U.P. before milder winter turn later this week.