An Impundulu is a vampiric entity from South Africa. They are also called lightning birds and are said to look like a black and white, human-sized hammerkop, a kind of wading bird. They can take human form and may appear or form where lightning strikes the ground, and they can also summon lightning with their wings and talons. Their appetite for blood is immense, and they may take on the form of a human male to lure women away and presumably drink their blood. In some versions, however, only women can see the Impundulu's true form under its human-shaped disguise. The bloodthirst may be partially inspired by the Red-Billed Oxpecker, which eats ticks but also will peck at wounds on cattle and other megafauna, actually keeping the wound open so they can continue to drink blood. How these attributes got transferred to the hammerkop seems strange, since it is a rather harmless bird.
Impundulu are also common familiars for magic-users in South Africa mythology, and certain elements of them have powerful magical uses, and they must be harvested in particular ways.
I drew this entirely on GIMP, as well as coloring it there. I imagine it's actually quite a bit taller than an average person when it stands straight up, but with its hunched gait it is about 6 feet.