A pegacorn is a pony type combining the distinctive features of a pegasus and a unicorn. Although both are winged, horned equines, pegacorns are contrasted with alicorns, who have the characteristics of Earth ponies as well as those of unicorns and pegasi. Alicorns tend to be larger and more solidly built than pegacorns, but it can be difficult to determine if a given pony with both wings and a horn is an alicorn or pegacorn by visual inspection alone. Pegacorns are much more common than alicorns, occurring with similar frequency to earth unicorns and earth pegasi in mixed-breeding pony populations, at a rate of about 1 in 20000 births. Alicorns, on the other hand, are vanishingly rare.