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) [XC452389]
by Bruce Lagerquist from Bill Williams Rv, NWR, HQ and Delta, La Paz County, Arizona, United States (call, song)
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.