Togo mouse
The Togo Mouse is considered to be either critically endangered or extinct depending on the authority.  Schlitter (1989) classified it as extinct, because subsequent surveys to the area failed to recover it.  Grubb et al. (1998) noted that these surveys inadequately sampled appropriate habitat in Togo and neighboring Ghana, and they were reluctant to declare the species extinct.  Musser and Carleton (2005) emphasized that insectivorous muroids as a group have proven difficult to capture, and that intense surveys of high elevation forest in this region are required to determine if it still persists.