I have a vague idea that this creature is related either to witches or vampires, but I'm not entirely certain, and I could be wrong about it being a hoop snake variant. I've read a lot of material about cryptids and mythological creatures, so I could be mixing things up.
Basically, I'm trying to find a name and a more detailed account of the milk-drinking snake-creature.
Various searches have mostly turned up information about normal milk snakes, which isn't helpful. If someone can give me a name for this creature or at least point out which country/culture the legend likely came from, I would appreciate it.