>>57939298As you can see, the shaggy hair on the back was mistaken for spines. The bright eyes were the tapetum lucidum in direct light, like lamps at night. The large canines were merely a visual effect due to swollen gums. The alien skin was bald areas attacked by Demodex.
I worked with social assistance organizations in rural towns, and part of my job was to provide veterinary care to farm animals, as well as take an inventory of wildlife-related deaths and replenish those livestock. Thanks to this, we were able to witness this phenomenon by hunting many of these "Chupacabras" and explaining to the communities what they were really about. We also had a case with a black bear; at night, it looks like a naked, deformed man. There, you'd have a possible explanation for Bigfoot and Sasquatch, only with a grizzly or polar bear with mange.