Clark's Grebe (Aechmophorus clarkii) [XC565871]
by Richard E. Webster from Bear River Migratory Bird Refuge, Box Elder County, UT, United States (call)
Clark's Grebe (Aechmophorus clarkii) [XC565872]
by Paul Marvin from Bear River Migratory Bird Refuge, Box Elder County, UT, United States (call)
Subspecies
Recently separated from Western Grebe (Aechmophorus occidentalis), with which it was formely considered merely a light phase.
The following 2 subspecies are recognised:
clarkii (Lawrence, 1858) - Mexican Plateau from northern Chihuahua to northern Guerrero; Nayarit; (?) L Caballo (New Mexico).
transitionalis Dickerman, 1986 - Western USA, north to Utah and Colorado.