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Alien Stingrays were creatures that lived in swarms of billions and due to their sheer mass were able to open wormholes in space by moving at fast speeds. They were named Alien Stingrays by UNIT due to superficial resemblance to the stingrays that live in Earth's seas.
Biology
The Stingrays had an exoskeleton of metal to enable them safe travel through the Wormholes they created. Their digestive system allowed them to eat anything including metal which was used to make their exoskeleton ,once digested They were seemingly unintelligent and incapable of speech. They acted on the instinct to devour and move on. They moved from planet to planet by creating wormholes. They created these by swarming around the planet many times so their sheer mass would rip space creating a wormhole they then travelled through. Their exoskeleton could protect them agaisnt bullets but not explosives as shown when UNIT managed to dispatch three of their members using a mounted rocket launcher when ordinary rifles had no effect.
History
A swarm of Alien Stingrays opened a wormhole that led them to the planet San Helios. There they swarmed the planet and devoured everything, turning it into a barren desert. They then began making a second wormhole with which to leave the planet. A number of the stingrays were trapped in the hull of the Tritovore's ship. They were dormant there, but a temperature rise due to body heat awoke them and they devoured the two Tritovore occupants of the ship. Malcolm Taylor managed to close off their latest wormhole that lead to Earth. However three members made it through and attempted to attack Earth. However UNIT used missiles to blast the three of them out of the sky. The ones trapped on San Helios merely made another worm hole but the Doctor decided to guide this and all their future wormholes onto uninhabited planets, where they could feed on natural structures.