These things have attributes that no known animal has, like glowing red eyes (fungus and deep sea animals can bio-luminesce but no mammal).
You should look at NIDS findings from Skinwalker Ranch and their high Bigfoot contact if you want to come closer to what this subject is really about. Bigelow found the best and brightest scientist out there, paid the, premium prices and let them study thus weird phenomenon that was going on. Some of the weirdness include a bullet proof dire wolf, UFO's galore, bigfoots galore, shadow people, raptors, dinosaurs, predator like transparent creatures, creatures never seen in this world like a hyena fox hybrid, portals, cattle mutilations and all other types of crazy events....just really bizarre shit. And what they found is that when they went to record this stuff, it was always one step ahead of them....in fact, one time they set up a camera with other cameras pointing at that camera, and the very second one camera died, all the other ones died - the worse were then ripped out and the cameras broken.