According to Ancient Greek mythology winged and clawed bird-women lured sailors to destruction through the power of their song...How and why did these monster bird women get transformed into sexy mermaids?
"Avian symbolism in the Greek imagination was relatively common. In ancient mythology, birds were used to represent everything from oracles, enchantresses, messengers of deities, and mediators between the human world and the supernatural realm." C. Hastings 2/11/19
this from Vice: Sirens Are Actually Bird-Bodied Messengers of Death, Not Sexy Mermaids