I see a lot of concern in this thread that future TVs would just peer-to-peer or cellular connect to do their dastardly functions. Wouldn’t this be preventable by putting a fine wire mesh around the box on the rear of the panel? Sure, the signal could still go out through the panel, but that’s bound to incur a lot of interference from the panel itself, right?

That looks like it might be a baby stinkpot (S. Odoratus)! They’re a kind of mud turtle, so marshes are their happy place.
Baby snappers have long tails, but it could also be one of those that lost its tail.