Believe it or not, I spent a few summers live trapping marmots in Yukon as part of an ecology research project . We trapped Hoary marmots, but this may also work on YBMs.
At first, we had trouble getting them to enter the traps...until we discovered they were attracted to human urine. Set the trap, dribble some pee on the trigger, and give it some time.
We would often pre-bait our traps and by the 3rd day the hoary marmots were essentially waiting by the trap for us to come by again.
Might work for YBM too!
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