Pegasus
From Ardrana
Pegasi are magnificent winged steeds that often serve the cause of good. These intelligent creatures are very shy and wild, not easily tamed. They serve only good characters, and when they do, they will serve their master with absolute faithfulness for the rest of his life.
A pegasus is a thoroughbred which resembles an Arabian horse (though slightly larger) with two large feathered wings. Pegasi are usually white, but brown pegasi are not unknown, and rumors persist of black pegasi. As should be expected, alignments do not vary according to color (all pegasi are chaotic good). Pegasi are 17 hands tall (5 feet at the shoulder) and weigh over 1,500 pounds. Pegasi must be ridden bareback; they will not accept saddles.
Pegasi speak their own language and can communicate with horses. They can understand common, and will obey their master's commands if they are given in that language.
Note: Pegasi originally appeared in this form in the 2nd Edition Monstrous Manual for the AD&D game from TSR. Their use here is for the purposes of providing context for the campaign only.