Screeching

The Screeching are a group of blue-plumaged harpies found residing in Screeching Canyon in the Thousand Needles.

They storage their foodstuffs in the depths of their lair.

Some time after the Cataclysm, four screeching harpies attacked Freewind Post. One of them snatched a tauren named Corewind, but Thalia Amberhide rescued him. They were attacking it irregularly, every three or four days.

They are also present in Suramar on the Broken Isles.

Unnamed

 * Screeching Harpy
 * Screeching Roguefeather
 * Screeching Windcaller
 * Screeching Hag-Sister

Speculation
They could be the harpies that attacked Kova Broadhorn and Miles Corebender while in the Needles.