The beautiful Black-throated Sparrow (Amphispiza bilineata) calls are very quiet and very high-pitched (7500+Hz), making them difficult for some observers to hear. They have two songs: one is a delightful twinkling ramble, also sung very quietly. Both the calls and the song are on this sample, recorded 1/17/99 north of Phoenix, with the Telinga mic from only 20 feet.
Two birds in the trees at Kickapoo Cavern State Park north of Brackettville in Texas, as dusk encroaches. The Black-Throated Sparrow (Amphispiza bilineata) is a common bird throughout the desert Southwest reaching into Texas, and these two were at the far eastern edge of their normal range. The immature, juvenile bird lacks the distinctive black patch on the throat.