Are bestow creatures auras?

Are bestow creatures auras?

A creature with bestow is not an Aura while it is in your library or even your hand. It becomes an Aura when you cast it by paying its alternate “bestow” cost and have a legal target for it. It remains an Aura until it “falls off” or no longer can legally enchant what it’s attached to. Jul 14, 2014

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