Because harpies are made up creature resembling angels that
shoot metal feathers at any trespassers of what the harpies are
guarding... Why would yu want harpies to be real they will kill
you...
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The Harpies were goddesses, and never destroyed being immortal
and ageless.
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Harpies are the hounds of Hades, so I guess they are from the
Underworld.
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The Harpies were personified storm winds, so they lived all
around.