Never mind the slinky (best answer, I think), what are you using on the t-posts to hold that feeder up? And, 'coons, not to mention pigs, don't play unholy hell on that thing? I like the set up very much, 'just don't see how it won't be torn to shreds by the varmints.
...and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that moveth upon the earth. Gen. 1:28
My WAG will be that it is a bird that has landed or taking off from the top of the trail cam. The camera is moving as the bird is leaving or landing from the camera. What you are seeing is the ends of the wing tips. I have seen it on my TC pics before...those birds will leave little piles of evidence on top of the TC's also.
I welded some 1 inch tube steel into a horizontal bar with 2 vertical legs. Attached them with ring clamps. Have not seen any hogs around here, thankful for that. And I haven't seen any other varmints.
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