This title is a combination of "devils" and "tribbles", as in Star Trek's "Trouble with Tribbles". The little debbles are actually white-tailed antelope squirrels and they live under a big rock, next to the bird feeders. There is an entire family of them. We saw them a lot in the spring, but they seemed to disappear during the summer, which made us speculate whether the snakes kept them under control, so to speak.
It is colder now, at least temporarily, and the snakes have probably gone into hibernation and the little debbles are out enjoying the sunshine, and the birdseed. One of them was bold enough this spring to try and gnaw a hole into the plastic birdseed bucket, prompting me to buy a metal can. I do enjoy watching their antics.