Shadhavar (Arabic: شادهوار) is a legendary unicorn-like creature known from the Medieval Muslim zoological literature. Al-Qazwini said that it lives in Rûm (Asia Minor), has one horn with 42 hollow branches and when the wind passes through them, it produces a pleasant sound, that makes the animals sit around and listen. Horns of those creatures, sometimes gifted to kings, can be played on like a flute. When played on one side, they produce a cheerful sound, and when the other, the music is so sad it makes people cry.
Al-Damiri increased the number of branches to 72 and al-Mustawfi made shadhavar a ferocious carnivore. The change can be explained with merging its description with another creature from Qazwini, the siranis (سيرانس), a predator that plays music to lure its victims. G. Jacob pointed out similarities between the siranis and the sirens from Greek mythology.