It would be really cool if horses could fly. But the scientific method doesn't accept "it would be cool" as evidence. If there had been a horse with wings we might see fossils of one. Fossils are basically bones that have turned into stone, so they last much, much longer than bone. We have many fossils of horses and their ancestors. No one has ever found fossils of horses with wings. That is not proof that they never existed. Maybe they never got fossilized. Maybe the fossils are out there but we haven't found them yet.

Another important question is whether a horse with wings could fly.Unfortunately, what we know from physics, which tells us about energyand matter (stuff), and biology, which tells us about living things, tells us horses couldn't fly even if they had wings.

Let's look as some kinds of flying animals. Lots of insects fly. Most birds fly. The only true flying mammals are bats (flying squirrels just glide). Things that fly must be very light. They have thin bones. A bird's feathers usually weight more than its bones. They eathigh-quality food that doesn't take long to digest.

Horses have large heavy bones with heavy hooves. Now, you could imagine a horse with light bones, but they wouldn't be strong enough to allow the horse to run. Racehorses are bred to have light bones and they sometimes break when they run. Even racehorses are really heavy.

Horses eat grasses, and then take a long time to digest it, so they haveheavy food. Geese are one of the few grazing birds, but they don't eat much during their flying season and don't fly much during their eating season.

Can we prove that Pegasus never existed? No, but it doesn't seem likely.

What other evidence would convince you that Pegasus did or didn't exist? Looking at flying animals may give you some clues.

No. The existence of a winged, flying horse is impossible; there is not enough room in a horse's body to hold the muscles needed to operate its wings powerfully enough to fly.