Harpy

Harpy, literally means witch that snatches, and very much looks like one. They are winged creatures that some people confuse with Sirens, with a face that looks like a hag. In the Percy Jackson series at Camp Half Blood, there are cleaning harpies and harpies that come put to eat demigods that are out of thier cabins at night.

Family
A harpy was known as the mother of Zephyros, the west wind, sisters of Iris and daughters of Thauma, and Electra

Ocupation

Phineas a king of Thrace, like Apollo, had a gift of prophicies. Zeus was angered by the information he was revealing that he sealed him away to a island with buffet of food that Phineas could never eat. The Harpies would always snatch the food form him and take it away.