Rock Sandpiper (Calidris ptilocnemis) [XC28512]
by Frank Lambert from North Jetty, Humboldt Bay, Humboldt Co., California, United States (call)
Rock Sandpiper (Calidris ptilocnemis) [XC28511]
by Andrew Spencer from North Jetty, Humboldt Bay, Humboldt Co., California, United States (call)
Subspecies
Forms superspecies with Purple Sandpiper (Calidris maritima). Formerly considered conspecific with Purple Sandpiper (Calidris maritima).
The following 4 subspecies are recognised:
ptilocnemis (Coues, 1873) - St Matthew and Hall Is and Pribilof Is. Winters on Alaska Peninsula.
quarta (Hartert, 1920) - Kuril Is, southern Kamchatka and Commander Is.
tschuktschorum (Portenko, 1937) - Eastern Chukotskiy Peninsula, St Lawrence I, Nunivak I and western Alaska. Winters in north-western North America and locally in eastern Japan.
couesi (Ridgway, 1880) - Aleutian Is and Alaska Peninsula.