Emathides
The daughters of the Macedonian king Pierus. Their name refers to Emathia, a part of Macedonia, or to their uncle Emathus, but are also called Pierides, after Pierus himself. They once challenged the Muses to a contest, and one of them sings of Typhoeus and the flight of the gods to Egypt. The Emathides are defeated and turned into magpies for their insolence.
Pierides is also a surname of the Muses, either after the region of Pieria in Thessaly or from King Pierus who reputedly introduced their worship.1
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The birds are called: Colymbas, Iyngx, Cenchris, Cissa, Chloris, Acalanthis, Nessa, Pipo, and Dracontis.