Thryophilus nicefori is an endemic species of Colombia that was discovered in the 1940s and described by Rodolphe Meyer de Schaeunsee (author of “Birds of the Republic of Colombia”) in 1946. All known populations of the species face a progressive loss of habitat caused by the transformation of forests into farmland, the pressure of goat farming, forest fires, and the drying of streams and rivers. These activities have generated massive destruction of vegetation and have prevented its regeneration, which is why Thryophilus nicefori is currently listed as Critically Endangered (CR) according to the IUCN Red List. In residential areas, they are exposed to predation by domestic animals, such as cats. In the municipality of San Gil, where the species was first described and where seven pairs were reported in 2004, several have disappeared as a result of the urban expansion. The loss of territories and pairs has also been detected in the Butaregua and Macaregua villages due to the expansion of tobacco crops and pastures for livestock.

More info at https://proaves.org/en/niceforos-wren-critically-endangered-cr/