They are usually seen in groups of five to ten individuals though there seems to be a complete lack of interaction between them. It almost looks like they manage to remain grouped and fly together while completely unaware of each other. A behavior I have never noticed in any other social creature.
Only a bit smaller than an average cat they have an elongated body that bends in the shape of a slanted S when landed. The two membrane lined appendages that constitute their main wings are held straight in front of the body, holding it upright.
Their tail ends in two horizontal and relatively thick membranes reminiscent of cetaceans yet thinner and longer. As they take off their body unfolds rapidly like a spring and at the top of their impresive leap both tail and wings start ondulating harmoniously giving the impression of a creature swimming in midair. While practically static on land they make up for their lack of mobility by being extremely talented gliders. The unique set of flight appendages gives them an air of grace and fluidity in their movements that is not seen among birds or insects.
Sadly this elegance quickly fades when the creature is observed up close. Their bodies are covered in a greyish skin who’s closest equivalent would be human. That skin turns translucent and gel like over the wings and tail leaving some white cartilaginous ribs show through it. As for the ovoid head area, it is bare if not for two tiny -and seemingly vestigial- side-facing eyes. The mouth could be described as a wide slit, splitting the lower third of the head from the upper part. It has only been seen opening mid flight in a fast snapping motion to catch some unidentified prey. This snapping motion produces a distinct clicking sound that is audible from the ground.
I shall name them cetapterons, commonly named kite worms.
All attempts at capturing one have failed.
Subeden, Day 4