Related to Lise C. Ruud, 'Six Monstrous Pigs: Animal Monsters and Museum Practices in the Eighteenth-Century El Real Gabinete de Historia Natural', in Liv Emma Thorsen, et. al. (eds), Animals on Display. 2013. pp. 15-36.
Description:

Ruud notes that 'In 1778, the museum [the Real Gabinete de Historia Natural] director Dávila wrote a two-page description of a piglet that had been donated to the museum... this document lacks information about the monster's provenance... it was the piglets and its deviances that were the focus - as an object for scientific study...

the text starts with an underscoring of the monster's normality: "Its structure is similar to that of any other pig, except for the head, which is irregular." However, the focus on normality is soon abandoned in favour of a narrow focus on the abnormalities, and the monster piglet is described as "the rarest character among the monsters" in the collections. This status was gained from its three peculiarities: it had a nose shaped like an elephant's trunk; its two eyes were melded into one, like a cyclops; and it had a very extraneous position of the jaws and teeth, with three canines, one in the front mouth sticking out like a beak.' (20-21)

Also that 'in Dávila's description, the pig was characterized in Spanish as ojanco, a reference to the Cantabrian one-eyed folklore figure Ojáncano, a northern Spanish variant of the cyclops embodying rage, cruelty, and evil.' (23)

NB: she also states that 'In 1779... Dávila wrote about the rare piglet discussed above' (24)