"The first thing that you must understand is that they are not merely horses with wings. Appearance does not denote fact whatever the common folk may think. Indeed, their entire internal structure is completely different from that of any horses that I've examined. Pegasi are omnivorous creatures, capable of eating both flesh and vegetable matter whereas horses are strictly grazers. Those corrupted by the Taint are frequently entirely carnivorous, their normally flat teeth often sharpening into vicious fangs. Their bone structure, unsurprisingly, is far more similar to that of birds than those of horses, which is part of what allows them flight. I must confess however, that I do not think their ability to fly is entirely explainable by natural law. I know of a Pegasus that carried a heavily armoured knight upon her back with no sign of strain even after twelve hours of sustained flight, a feat that seems impossible. An acquaintance of mine from the College of Light suggests that Pegasi may somehow be able to literally 'ride' on the Winds of Magic that blow from the north. While I don't feel qualified to confirm or deny such speculation, I put it forward for your consideration."
Marianne Sosber, Anatomist, Warhammer Fantasy Roleplay: Old World Bestiary — A Compendium of Creatures Fair and Foul
Percy: Hey, why do pegasi gallop as they fly, anyway?
Blackjack: Why do humans swing their arms as they walk? I dunno, boss. It just feels right.
Blackjack: Why do humans swing their arms as they walk? I dunno, boss. It just feels right.
— Percy Jackson and the Olympians: The Last Olympian (Chapter 11)
