In Greek folklore, vampire women with the power to transform
themselves into birds of prey or other sinister animals.
The striges derived from the Roman strix, a night demon,
named for the screech owl. It was believed to attack infants and
drain their blood. The strix appears across southern Europe,
where it is known variously as strega (Italy), striges (Greece), and
strigoi (Romania). The striges differed from other vampire
creatures in that they were thought of as living members of the
community rather than the returning dead.
Melton, J. Gordon. The Vampire Book The Encyclopedia of the
Undead. Detroit Visible Ink Press, 1994.