A new study has suggested that animals heavier than 41 kgs with wingspans greater than 16.7 feet wouldn't be able to flap fast enough to stay aloft which indicates that giant Pterosaurs could not fly.According to a report in National Geographic News ,the conclusion casts serious doubt on the flying ability of large pterosaurs such as Quetzalcoatlus though to be one the largest airborne animals of all time. The late Cretaceous creature may have weighed up to 250 kgs and had up to 34.1 foot wingspan.
