White-throated Swift (Aeronautes saxatalis) [XC548581]
by Richard E. Webster from Mount Diablo SP, Clayton, Contra Costa County, California, United States (call)
White-throated Swift (Aeronautes saxatalis) [XC368921]
by Thomas Magarian from Texas (near Fort Davis), Jeff Davis County, Texas, United States (flight call, song)
Subspecies
Closely related to White-tipped Swift (Aeronautes montivagus).
The following 2 subspecies are recognised:
saxatalis Woodhouse, 1853 - South-western Canada south through western USA to southern Mexico (Oaxaca) west of Caribbean lowlands.
nigrior Dickey & van Rossem, 1928 - Southern Mexico (Chiapas) to central Honduras.