Mental Floss has a nice rundown of supernatural monstrosities of traditional African folklore, including ghost apes, flying reptiles, and, at right, the one-eyed Popobawa bat and airborne vampiric pest the Adze:
The Popobawa is a fairly recent manifestation reported in Zanzibar and Tanzania. The creature is a demon who appears as a normal human by day, and a one-eyed, bat-winged monster at night. The Popobawa attacks and sodomizes both men and women in the dark of night. Reports of attacks come every few years, with a large number in 1995 attributed to mass hysteria.
The Adze is a vampire in the legends of the Ewe people of Ghana and Togo. It takes the form of a firefly, but if you capture one, it will revert to human appearance. In the insect form, the adze will suck your blood while you sleep and spread disease, which is a possible explanation for malarial outbreaks.