An early description of the karkadann comes from the 10/11th century Persian scholar
Al-Biruni (973–1048). He describes an animal which has "the build of a buffalo...a black, scaly skin; a
dewlap hanging down under the skin. It has three yellow hooves on each foot...The tail is not long. The eyes lie low, farther down the cheek than is the case with all other animals. On the top of the nose there is a single horn which is bent upwards." A fragment of Al-Biruni preserved in the work of another author adds a few more characteristics: "the horn is conical, bent back towards the head, and longer than a span...the animal's ears protrude on both sides like those of a donkey, and...its upper lip forms into a finger-shape, like the protrusion on the end of an elephant's trunk." These two descriptions leave no doubt that the
Indian Rhinoceros is the basis for the animal. After Al-Biruni, Persian scholars took his description and formed ever more fanciful versions of the beast, aided by the absence of first-hand knowledge and the difficulty of reading and interpreting old Arabic script. A decisive shift in description concerned the horn: where Al-Biruni had stuck to the short, curved horn, later writers made it a long, straight horn, which was shifted in artists' representations from the animal's nose to its brow. The Persian physician
Zakariya al-Qazwini (Al-Qazwini, d. 1283) is one of the writers who at the end of the thirteenth century links the karkadann's horn with poison, Later authors had the horn perspire when poison is present, suggesting the horn is an
antidote and connecting it to
alicorn, though this connection is not made by all writers. this is the legend that is told in
One Thousand and One Nights in the
"Second Voyage of Sinbad the Sailor". The karkadann is referred to by Elmer Suhr as the "Persian version of the unicorn". The name appears also in medieval European
bestiaries, such as those from Escorial and Paris, where the name
karkadann appears in the captions of unicorn illustrations. ==Horn==