More than 90% of lemurs are facing extinction, according to the International Union for the Conservation of Nature (IUCN).
There are 99 known species of the primate, which live only on the island of Madagascar. Of that, 22 species are considered critically endangered and 48% are endangered. A further 20 species were listed as vulnerable to extinction.
The primates are threatened by destruction to their tropical habitat in Madagascar, where as much as 90% of original vegetation has been destroyed.
The remaining vegetation is severely fragmented and lemurs are also hunted for food.
Thomas Lacher, of Texas A and M University, said: “The high level of threat among lemurs is particularly troubling and calls for significant conservation action. These distinctive primates serve a critical role in the threatened ecosystems of Madagascar.
“They also represent an important source of tourism revenue for the country and, as a result, are a clear case where conservation can provide local economic benefits.”