I returned to the red fox (Vulpes vulpes) den. An adult interacted with two of the kits and then left the den. It seems that the same individual returned perhaps 45 minutes later with prey. The prey looks like a columbian ground squirrel. I took quite a few images, of course, but I did not have time to process them yet, except for this one photo.
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Red fox (Vulpes vulpes) returning to the den with prey (columbian ground squirrel), Montana, USA