It depends on what you mean by proof.
1. hair samples (contentious topic, norse and hifler please don't chime in on this)
2. footprints galore
3. many videos and photos
4. eyewitness reports (if these are good enough to convict someone of murder - beyond a reasonable doubt, I have to give them some weight)
None of these things prevent or confirm it being in the "other than an animal" realm. While camping with a friend, we both witnessed a phenomenal, long lasting orb event. As I've researched, I have arrived at the same conclusion that MIB alludes to, although I wouldn't call those who don't know this "ignorant". Our understanding of physics is rudimentary. We like to think we know everything about our natural world, but there are many, many things happening outside of our perceptive capabilities. I suspect much of what is attributed to the "woo" is just a part of our physical reality that we just aren't capable of understanding with our current baseline knowledge of physics.
Mods, please don't move this thread to the backpages of the forum. This stuff is front and center in our community today, and it should be fleshed out and debated vociferously.