A critically endangered species of bats not sighted in 40 years has been found in Rwanda, with the "incredible" discovery delighting conservationists who had feared it was already extinct.

But the Hill's Horseshoe Bat was in fact still clinging to life in Rwanda's Nyungwe Forest -- a dense rainforest that is home to endangered mountain gorillas -- the consortium behind the discovery said.

There had been no information on the population of the mammals and the International Union for Conservation of Nature (IUCN) in 2021 listed them as critically endangered.

Rediscovering the lost species "was incredible", Jon Flanders, director for Bat Conservation International (BCI), said in a statement late Tuesday.

"It's astonishing to think that we're the first people to see this bat in so long."

The Texas-based non-profit had partnered with the Rwanda Development Board and Rwanda Wildlife Conservation Association to conduct surveys in the jungle starting in 2013.

In 2019, after a 10-day expedition scouring the caves in the forest, the scientists found the bat.

"We knew immediately that the bat we had captured was unusual and remarkable," BCI's chief scientist Winifred Frick said.

"The facial features were exaggerated to the point of comical."

But it took them another three years to verify its species.

The creatures of the night have long been infamous as fanged monsters or vectors of disease, with the coronavirus pandemic doing little to improve that image after scientists said Covid-19 likely originated in the animals.

From the tiny two-gram "bumblebee bat", to the giant Philippine flying fox with its 1.5-metre (five-foot) wingspan, bats make up a fifth of all terrestrial mammals.

Some 40 percent of the 1,321 species assessed on the IUCN's Red List are now classified as endangered.

Human actions -- including deforestation and habitat loss -- are to blame.

For the researchers in Rwanda, the elusive discovery marks the beginning of a new race to save the once lost species from disappearing again.

"Now our real work begins to figure out how to protect this species long into the future," said Flanders.

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