Sleipnir can only reproduce when another Sleipnir
disappears.
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Yes, in Norse myth Sleipnir does have eight legs/feet.
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Sleipnir was the name of his horse. According to legend,
Sleipnir has eight legs (symbolizing the directions on a compass or
the eight spoked wheel of the year) and carried Odin between the
world of the gods and the material world.
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Yes.
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The eight-legged horse ridden by Odin was named Sleipnir,
meaning "Swift one" or "Light footed one".