nostr:npub1e4lmfjpz6307vpecqxhytj90ldun7ds0nuw8424pfpvnyvjnj59qjs53m6 
I think you're totally right. I looked at my other photos of sidewinders. I was trying to keep far enough away and still get a photo while holding the phone and the light so I didn't take a super good look at it. It didn't immediately move like a sidewinder, so it didn't register as one. It was big for a sidewinder! All the others have seen have been dinky.