Llamhigyn Y Dwr, also known as Water Leaper is a malicious creature from Welsh mythology and folklore that lived in swamps, ponds, rivers, and lakes. It was said to be a giant, limbless frog or toad with a bat's membranous wings (sometimes even a bird's feathery wings) and a long, reptilian tail with a large stinger at the tip. It leapt across the water using its wings, hence its name. Its favorite prey were fish, poor sheep who wandered too close to the water's edge, or even fishermen! It was said that its appearance alone was to strike one dead, never mind its venomous stinger or blood-curdling screech. Llamhigyn Y Dwr was said to shriek, which stunned its prey, leap up from the water and snap the fishing line of fishermen, dragging the poor soul into the water's abyss, only to be speedily engulfed by a malignant, and quite insatiable, maw. There have not been any modern sightings, so if it existed, it might be endangered or extinct, possibly due to hunting.
It could be a sighting of a misidentified stingray. It may also be a Chimeara, part bat, frog and lizard.