Fantasy
Weialalaleia
The Weialalaleia (Hirudo Threnophaga) is difficult to observe, and is more recognisable by the sound that accompanies its presence than by its shape. It floats on the air like a jellyfish in water, and, like a jellyfish, is translucent, although there is some debate within cryptohirudological circles about whether the Weialalaleia lacks pigment.