I'd noticed the tromboncino squash leaves disappearing, but because the vines were so robust and sprawling (and we could hardly eat all the squash, anyway), I assumed that deer had jumped the fence beneath the powerline corridor.
But, my gardening companion reports that it's actually a rather large woodchuck (aargh!) that scuttled back into a burrow beneath the brush pile.
Hmm, it's back to Chuckster bait, woodchuck lure, and a large Havahart trap after I get home.