Tiny Nigerian bat once feared extinct rediscovered in rainforest sanctuary

A small bat species once believed to have disappeared from the wild has been rediscovered in a rainforest sanctuary in southern Nigeria, where scientists are now working to protect what is considered the only confirmed active roosting colony of the animal.

The short-tailed roundleaf bat, known scientifically as Hipposideros curtus, was found in 2016 by Nigerian biologist Iroro Tanshi during field research in the Afi Mountain Wildlife Sanctuary in Cross River state.The discovery came decades after the species had last been recorded in the wild during the 1970s.

Researchers had feared that the bat had become extinct after previously documented habitats in parts of Cameroon and Equatorial Guinea disappeared because of deforestation and other human pressures.Tanshi was conducting doctoral research when her team captured the bat during a night expedition.

The scientists had been setting traps near a known bat roost when they noticed one animal that appeared different from the others.She said the bat’s unusually large ears and distinct features led her to consult identification records, which confirmed that the specimen was the short-tailed roundleaf bat.

The discovery prompted further surveys across cave networks in the Afi sanctuary and nearby Cross River National Park. Using harp traps and mist nets, Tanshi and local assistants identified 15 additional bats from the species.The short-tailed roundleaf bat is a small insect-eating mammal that weighs roughly the same as a teaspoon of salt.

Unlike larger fruit bats, it has small eyes and a highly developed nose structure that helps it navigate through darkness using echolocation.Because the species relies heavily on sound and is sensitive to disturbance, researchers have adapted their methods to avoid harming the animals.

Tanshi said she often uses red light during fieldwork because bright lights and noise can affect the bats.The rediscovery highlighted the importance of the Afi sanctuary, a protected rainforest area that supports several threatened species, including gorillas, drill monkeys and other wildlife.

However, Tanshi said she found that public awareness and conservation efforts were often focused on larger animals, while smaller species such as bats received less attention.She said local communities had strong cultural connections with some large mammals and often understood the need to protect them. Bats, however, continued to face threats despite existing conservation protections.

One of the major challenges has been hunting. In some communities, bats are considered a source of food and are traded as bushmeat.Bats have also historically faced negative perceptions in many societies, with some communities associating them with superstition or disease.

Tanshi described attitudes toward bats as complicated, noting that public concerns around diseases such as Ebola and Covid-19 had further influenced perceptions.In response to the threats facing bats and other small mammals, Tanshi and bat specialist Benneth Obitte established the Small Mammal Conservation Organisation in 2016.

The organisation later launched the Zero Wildfire Campaign, aimed at reducing forest fires that damage habitats and threaten wildlife.The campaign introduced colour-coded warning systems to help farmers manage controlled burning and reduce accidental fires.

Tanshi also created a community-based Forest Guardians group to monitor burning activities and respond quickly when fires spread.According to Tanshi, wildfire incidents in the forest area have declined significantly over several years following these efforts.

Her conservation work around the Afi sanctuary has received international recognition. She was named a National Geographic explorer and received environmental awards for efforts to protect the rainforest ecosystem.

A decade after the discovery of the short-tailed roundleaf bat, Tanshi continues to study the biodiversity of Nigeria’s forests and the species that remain hidden within them.The scientist said the rediscovery demonstrated how little is still known about some ecosystems and how species thought to have vanished can sometimes survive unnoticed.

The survival of the bat colony has also raised questions about how conservation strategies can better include smaller and less visible species, particularly in regions facing habitat loss and pressure from human activity.

For researchers working in the Afi sanctuary, the discovery transformed a species once considered lost into a focus of renewed conservation efforts.