World Bird List

Species factsheet

Voices can be found here (external link)

Subspecies and Distribution

-Subspecie
+Distribution
-peninsularis
+sc Alaska, Yukon
-leucura
+w Canada
-rainierensis
+c and s Washington (USA)
-saxatilis
+Vancouver I.  (Canada)
-altipetens
+Rocky Mts. from Montana to New Mexico  (USA)