Black-tailed Gnatcatcher (Polioptila melanura) [XC492972]
by Richard E. Webster from Bill Williams River NWR, Arizona, United States (begging call, call)
Black-tailed Gnatcatcher (Polioptila) [XC595929]
by Richard E. Webster from San Bernardino National Wildlife Refuge, Cochise County, Arizona, United States (call, song)
Subspecies
Forms a superspecies with California Gnatcatcher (Polioptila californica), and previously treated as conspecific. Racial affiliation of birds recorded on islands of íngel de la Guarda, Coronado and San Esteban uncertain, tentatively included in lucida. Further study is required.
The following 3 subspecies are recognised:
lucida van Rossem, 1931 - South-western USA (extreme southern Nevada, south-eastern California, central Arizona) south to extreme north-western Mexico (north-eastern Baja California near San Felipe), also Gulf of California islands (íngel de la Guarda, Coronado, San Esteban).
melanura Lawrence, 1857 - Extreme southern USA (south-western New Mexico, southern Texas) southern on Mexican Plateau to Guanajuato, south-western Tamaulipas and west-central Hidalgo, possibly to northern Jalisco.
curtata van Rossem, 1932 - Tiburón I, off western Sonora (north-western Mexico).