World Bird List

Species factsheet

Voices can be found here (external link)

Subspecies and Distribution

-Subspecie
+Distribution
-carolinensis
+c and e Canada, c and e USA
-aculeata
+Pacific slope of w USA
-alexandrae
+n Baja California  (nw Mexico)
-tenuissima
+eastern slope and inland w USA
-nelsoni
+wc and sc USA, n Mexico
-mexicana
+w, c, e and s Mexico
-lagunae
+s Baja California  (nw Mexico)