Skyshark

            In order to prevent an endangered species of shark from going extinct, biologists begin giving the only two specimens in captivity hormone injections taken from a rare pacific bird with an exceptionally high sex drive and very durable young.  The sharks react well at first and begin mating, but the children they produce are a bit unusual.

            Shortly after birth, the shark tank clouds with blood as the babies eat their parents.  Once the young sharks are moved to a cleaner tank, it becomes clear that something is wrong with them.  They are surfacing to breathe, and they have strange slits around their lateral fins, like a seam of some kind.  After several deadly attacks on trainers attempting to feed or analyze the sharks, food is cut off to the beasts.  But instead of starving to death, they demonstrate their true abilities.  Their fins protrude out from their bodies, and stretch to reveal pterodactyl-like hinged wings, previously contained in their flanks.

            The sharks flee the tank, and after decimating the research lab, they begin trolling the countryside in search of food and potential mating partners.  A team is assembled from all corners of the Earth to hunt down the flying sharks before they make their way from small towns to big cities.