For ten points, name this animal, the most famous of which include Sleipnir and Pegasus.
The Scottish water devil Kelpie assumes the shape of one of these animals to trick travelers. In Korean myth, one of these animals bowed to a shining egg that contained the first king of Shilla. In Irish myth, Niamh owned one of these animals that could travel over waves. In Norse myth, a frost giant offered to rebuild the walls of Asgard with the help of one of these named Svadilfari, the mother of an even more famous one with eight legs. In Greek myth, one created from the blood of Medusa had wings. For ten points, name this animal, the most famous of which include Sleipnir and Pegasus.
The Scottish water devil Kelpie assumes the shape of one of these animals to trick travelers.
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