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We then used this index to gain insights about the survival and longevity of yellow-bellied marmots.

The researchers collected incisors from rodents that live in different environments: beavers, coypus, squirrels, marmots, rats, voles and mice.

In the meantime, the visitor center can point you toward alternative year-round destinations and trails open to ramblers from around the world and a diversity of animals, including Roosevelt elks, Olympic marmots and black bears.

The cries of mammalian infants, for example, can be incredibly similar, to the point that white-tailed deer will respond to whimpers whether they're made by marmots, humans or seals.

“You might think well, species like these: The ptarmigan or the marmots or whatever it is can just go uphill where it’s as cold as they like it,” Bond said.