There, young women are regularly "cleansed" by having sex with a hyena, sometimes as punishment for an offence such as having an abortion.
A hyena's main duty is overseeing a coming-of-age ritual, where girls take part in sex over a three-day period after their first menstruation. This is to mark their passage from childhood to womanhood. If the girls refuse, it's believed, disease or some fatal misfortune could befall their families or the village as a whole.
Mr Aniva, speaking to the BBC, said:
"Most of those I have slept with are girls, school-going girls.
"Some girls are just 12 or 13 years old, but I prefer them older. All these girls find pleasure in having me as their hyena.
"They actually are proud and tell other people that this man is a real man, he knows how to please a woman."But with one in 10 Malawians having HIV, the work of hyenas is riddled with the risk of spreading serious disease..And Mr Aniva himself has HIV, but continues his work regardless. He is paid $4 to $5 by locals to perform the sex rituals. He claims to have slept with 104 women and girls
And village elders, who are responsible for organising the "cleansing", insist that they are necessary to "avoid infection with their parents or the rest of the community".