ABSTRACT
Among other monstrosities and myths from the sea and aquatic bodies, the double-tailed mermaid has been profusely described and depicted in early modern literature, bestiaries and natural history treaties as in the iconography and cartography. Usually shown as a female form with one head and upper body and holding its two fish-like tails, it did represent the epitome of beautiful nature creations but also its strangeness and hybridity. With virtues and sins, love and danger within the same body, it could be the reflection of the moral and human acts’(dis)conformities. Besides the symbolic meaning of the mirror, or the twinning, could these mythical beings also be the result of non-understood observations of rare events in the sea? In this paper, more than providing answers, I am proposing some questions regarding early nature apprehension and natural knowledge production by relating the physicality of double-tailed mermaids with the real, yet highly obscure, occurrences of conjoined twins in sea animals. Conjoined or Siamese twins have, in fact, rarely been described in wild (marine) mammals but a couple of cases in cetaceans just came to light in recent years. Even though descriptions of monsters sometimes reveal more about people’s minds and perceptions than they do about the animals, the physical similarities between these two types of marine monsters, and the possibility of real observations resulting in imaginary animals will be discussed.
