So, I let the dog out tend to her necessaries, and received quite a shock:

After uttering some incomprehensible sounds and ushering Chocolate back in the house, I tried to formulate a plan. What the heck was I going to do with a dead
opossum? Gack! How did my dog manage to take down an opossum in the first place? Where's the blood? Gack! Sputter! More incomprehensible utterances!
The kidlet arrived at my side to see what my problem was. He looked at the varmint, and said, I think he's just
playing possum. Oh, said I, whilst smacking my forehead. Now it makes sense. That critter done fooled me! And, as if on cue, the opossum stopped grimacing and lifted its head:

So, naturally, I ran for my camera. When I opened the upstairs window, the possum kindly repeated its performance for us. While we waited for it to move along, my son told me all about opossums, their nocturnal nature, their prehensile tails, their diet, etc. Let's call that the serendipitous science lesson for the day. Aren't I lucky to have a such a knowledgeable teacher in the house?
After a few more minutes, the marsupial meandered away:

This critter has clearly tangled with a predator at some point, as their tails
(prehensile!!!) are normally longer.
Turkeys and opossums, oh my! Just another day in the wild kingdom.