Nure-onna (濡女, lit. “wet woman”)
Nure Onna is an amphibious creature with the head of a woman and the
body of a snake. While the description of her appearance varies slightly from
story to story, she has been described as being 300 m in length and has
snake-like eyes, long claws, fangs and long, beautiful hair.
She is typically spotted on a shore, washing her hair.
A nure-onna’s intention are unknown. In some stories, she is a
monstrous being who is powerful enough to crush trees with her tail and
feeds on humans. She carries with her a small, child-like bundle, which
she uses to attract potential victims. If a well-intentioned person
offers to hold the baby for her, the nure-onna will let them. If they attempt
to discard the bundle, however, it is revealed that it is not a child at all.
Instead, the bundle becomes incredibly heavy and prevents the victim
from fleeing. She then uses her long, snake-like tongue to suck all the
blood from her victim’s body. In other stories, a nure-onna is simply
seeking solitude as she washes her hair and reacts violently to
those who bother her.
originally from Wikipedia