Harpies are mythological creatures featured in the animated television show American Dragon: Jake Long.
They are creatures that Zeus summons to people that make Zeus upset. Harpies are seen in "Halloween Bash". Two female Harpies had chocolate bars at the party, but they decided to leave the party with their candy. They grabbed Jake, because Jake lost his Dragon powers to save the Dragon Council from the Huntsclan. They released Jake in front of the cemetery to help the Dragon Council from the Huntsclan.
From what is shown in the series, Harpies do not seem to actually possess magical powers. They are, however, very able fighters. When they've spotted their prey, they will lunge at it from the sky and attempt to slash it with their talons. Their claws are sharp and strong enough to cut through Dragon scales. When confronted with fire, they will most likely flee. Harpies are also strong enough to carry another human being in their arms.