The Sichuan treecreeper (Certhia tianquanensis) is a rare species of bird in the treecreeper family, Certhiidae.It was described as new to science (initially as a subspecies of the common treecreeper C. familiaris) in 1995 from 14 specimens taken at four sites in the mountains of western Sichuan, China. In 2002, it was realized that these birds constituted a distinct species, and subsequent research suggests it is closest to the Nepal treecreeper (C.