We've heard of the Abominable Snowman and the Loch Ness monster, but less well known is the chupacabra.
Literally translated as goat sucker, this mythical creature is said to have large fangs and a hairless dog-like body, and in some case spines that run the length of its back.
Its name comes from its apparent behaviour of killing livestock, especially goats, and sucking their blood.
Rumours of the creature began in 1995 in Peurto Rico, where livestock were found drained of their blood.
More recent accounts have actually been caught on camera, such as the case in 2007 when a woman in Texas found an animal outside her property that resembled a chupacabra.
Then, in 2008, a Texas police officer apparently captured dash cam footage of the animal. And in 2014 a Texas couple snared an animal alive that had similar characteristics.
In July this year, the Huffington Post reported that a man from Rockdale, Texas believed he had found the carcass of a chupacabra.
Oliviera said it had skin textured like an elephant's hide, paws like a raccoon and unusually large hind legs.
Even people who believe in the existence of the chupacabra, however, are sceptical about Oliviera's specimen. They say it may actually be a coyote or raccoon with mange - a skin disease caused by parasitic mites.