Wereowl

A wereowl, also known as a wrowl, was a lycanthrope that could turn into an owl.

Description
Wrowls took the form of human-sized snowy owls. At night, they would transform into these forms, which were highly intelligent, and even capable of speaking Common. They were agile in the air, and could perform aerial attacks.

Combat
When fighting, these shapechangers used both sets of claws and their beaks.

Ecology
Wrowls treated harpies as their natural enemies.

History
Wereowls were the first known avian lycanthropes.