White-tailed Ptarmigan (Lagopus leucura) [XC438515]
by Patrice Mathieu from Mushroom Rock, Rocky Mountains NP, Larimer County, Colorado, United States (call)
White-tailed Ptarmigan (Lagopus leucura) [XC388452]
by Niels Krabbe from Piegan Pass GNP, Glacier County, Montana, United States (call)
Subspecies
Validity of subspecies questionable. All may be invalid.
The following 5 subspecies are recognised:
peninsularis Chapman, 1902 - Mountains in Alaska, Yukon and Mackenzie, south to Kenai Peninsula and southern Yukon.
leucura (Richardson, 1831) - Northern Yukon, western Br. Columbia and western Alberta to northern border of US.