Pegasus

Pegasi (singular pegasus) look like magnificent white draft horses with elegant feathered wings. Their coats sparkle under the sun in a manner reminiscent of light playing over new-fallen snow. They are wild beasts, capable of staving a soldier’s head in with a well-placed blow from one of their hooves. While they seldom take to the ground, preferring the sky, when they do they are swift runners. Pegasi that haven’t been battle trained are far more likely to fly away then fight, excepting when their foals are in danger.

Source

 * Warhammer Fantasy RPG 2nd ED -- Old World Bestiary (pg. 105).