TBN,
I believe you answered your own question about the dug up traps in your last sentence of that post. If your not having troubles with dug up traps earlier in the season(when soil conditions are favorable) but having troubles later in the season(when ground is frozen or wet), it would suggest to me that your not bedding the traps as well or have contaminated soil your importing.
Asa,
When you say you don't really bed your traps in the snow but just wiggle them into the snow, you are in effect really kinda bedding them, or at least stabilizing them. When you wiggle them into a clean snow the bottom of the trap is freezing to the snow below the trap, in effect solidifying or stablizing the trap rather well, and the snow around it also freezes to it somewhat also stabilizing it. The only reason I brought this up is alot of those reading this never have trapped in deep snow and may picture a loose fit or loose bed.
The point you make about the difference in coyotes from location to location is also a good one. I was out in SD working a Delta contract. The second night I was there I heard coyotes howling in three directions from where I stood on the patio of the place I was renting. I got to thin king about coyotes at home and how long it has been since I heard a coyote howl in my part of Northern Mn. Best I could figure it was over 7 years. The coyotes here don't vocalize much as it lets the Timber wolves know where they are. As I type this my dogs are howling in their kennels. There is a pack west of my house that gets them riled up around this time of night quite often.
Slim,
In SD this year it was common to have badgers checking out all the fresh gogher dens, and quite often they dug several out, leaving the area looking like a cluster bomb had gone off. Used that to my advantage several times. Bought a #2 shovel just to fill the catch circles back in. Guess they got the last laugh!!
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Keep your boots dry