Chupacabra
For years, many assumed the Chupacabra was completely mythological. It could never be real, right? Mostly part of folklore throughout the Americas, it was heavily connected to vampirism, where it would attack livestock and drink their blood. It is hard to give a perfect description as they vary heavily depending on who spotted the thing. While it has been mostly part of the Americas, people have referenced it in places like Russia and the Philippines in the past. Some claim it is alien-like, with reptilian skin as large as a small bear. Even a rose of spines from its neck to the base of the tail. Others claim it fits more of a large dog appearance. Both are likely somewhat correct too.
In fact, this urban legend from the log of mysterious animals is real. However, people should know that this is not a solo creature but perhaps hundreds have existed. What people were likely seeing is a member of the canine family with something known as “the mange.” This is a skin disease caused by parasitic mites that cause creatures to lose their hair. It mostly affects canines compared to any other species, and they more than likely contract sarcoptic mange as well. Due to this, it is possible one can see their spine since the hair normally covers it. Coyotes and wolves likely had it and attacked livestock just like others from their species. However, people were unaware of the mange disease for centuries, so the legend took off effectively making them mysterious animals.