The Popo Bawa is "a bat-like ogre said to prey on men, women and children. ... for superstitious Zanzibaris a visit from the sodomising gremlin is no joke. Although no one ever has seen it, belief in the monster and his unnatural lust is so strong that entire villages will sleep out of doors for protection: Popo Bawa (Swahili for Bat's Wing) prefers to attack behind closed doors at night. In huts set amid rustling groves of jackfruit and mangoes on Zanzibar's Pemba island, victims told Reuters in interviews that they detected a bad smell, became cold and went into a trance in the moments before they felt the creature's inhuman strength. Some attacks were heralded by the sound of giant wings and claws rattling and scraping on huts' tin roofs. Others cringed in terror at what sounded like a car engine ticking over."
The bat-like part makes me think of the Mothman. Could the two be related? What foul beasts dwell unseen in Zanzibar?