|A Shtriga feeding on a child.|
There are different manners of killing the Shtriga, and the lore about them is pretty fuzzy. Some suggest that you they can only be killed when they are in their human disguise, and others say that the only time you can kill one is when it is feeding. A common lore is to make a cross of pig bones and put on a door. Then they can't leave the house, and can be killed.
A way of protection against these creatures is a little strange. Eventually she will vomit some of the blood she had drank from her victims. According to lore, if you scrape up some of this vomit onto a silver coin, wrap the coin in cloth, and wear it always, Shtriga can't harm you.
Scientist worked out a rational for the creatures, believe that the overly protective mothers who wrapped their children up for protection against the Shtriga, caused their kids to experience what is now called crib-death.
This is a clip from the series Supernatural, showing
a Shtrga that looks like the Emperor from Star Wars. It
is none-the-less, a good representation of what they do.
*The scary part is that it can take the form of any human, although it mostly chooses old woman, probably springing about the whole 'witches as crones' theories.
**Probably because the life is stronger in a small child, they are more likely to believe in them, or because they are easier to subdue.