The bat that weighs the same as a teaspoon of salt – and the biologist who rediscovered it

The short-tailed roundleaf bat was feared extinct until scientist Iroro Tanshi found one in Afi sanctuary in Nigeria, and set out to protect the only confirmed roosting colony

Just after sunrise, a cacophony of whoops and chatter can be heard over the verdant forests of the Afi mountain wildlife sanctuary. Nestled within the Cross River rainforest in south-east Nigeria, and spanning an area about the size of central Paris, the steep sanctuary is a haven for endangered gorillas, drill monkeys, the grey-necked rockfowl - and the short-tailed roundleaf bat.

The Nigerian biologist Iroro Tanshi remembers the moment she first spotted the endangered bat in 2016, during a field expedition for her PhD research. We were trapping near a roost that night, so we caught a lot of bats," says Tanshi. But, she adds: This looked very, very different. Big-eared." She promptly turned to her identification guide, which revealed that the tiny furry creature she was holding between her fingers was Hipposideros curtus, better known as the short-tailed roundleaf bat, last recorded in the wild in the 1970s.