Whenever I see a marmot I consider myself to be a guest in his neighborhood. It is up to me to adapt to him.

They do get quite aggressive in the Mt. Whitney area, probably because they are used to the constant parade of humans on the main trail all summer long. My buddy lost a Camelbak hose to them once.
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If you only travel on sunny days you will never reach your destination.*

* May not apply at certain latitudes in Canada and elsewhere.