Any grammar mistakes?
Perosaurs would not have been able to generate the energy needed to fly because it’s cool-blooded animal which have a slow metabolism and are unable to produce a lot of energy.Recently reasearchers found that pterosaur fossils had something similar to fur which is a typical feature of warm-blooded animals. Hair or fur can maintain a high body temerature of animals, especially when the days getting cold. So the metabolism of pterosaurs might supply the energy needed for powered flight.

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CORRECTED: 
Pterosaurs would not have been able to generate energy needed to fly because it’s a cold-blooded animal with slow metabolism and are unable to produce a lot of energy. Recently researchers found that Pterosaurs fossils had something similar to fury kinds of animals which is a typical feature of warm-blooded animals. The hair or fur of animals can maintain the high body temperature of animals, especially when days are getting cold. So the metabolism of Pterosaurs might supply the energy needed for powered flight.

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