Both the western and the now extinct eastern (Phylloscopus canariensis exsul) subspecies of the Canary Islands Chiffchaff were formerly considered subspecies of the Common Chiffchaff but were separated (Clement & Helbig, 1998; Sangster et al., 2001) due to their morphological, bioacoustical, and mtDNA sequence differences (Helbig et al., 1996).
Western Australia | Canary Islands | Western | Faroe Islands | Western (genre) | Solomon Islands | western | University of Western Ontario | Great Western Railway | Western Cape | Channel Islands | Falkland Islands | Marshall Islands | Western world | South Shetland Islands | Hawaiian Islands | Case Western Reserve University | Pacific Islands | London and North Western Railway | University of Western Australia | Saint Thomas, U.S. Virgin Islands | Western Ghats | Aleutian Islands | Western Front | Western Union | Cook Islands | Balearic Islands | Western Province | Kimberley (Western Australia) | Western Europe |