Dusky Nightjar
Antrostomus saturatus
The dusky nightjar is 21 to 25 cm (8.3 to 9.8 in) long. A male weighed 52.9 g (1.9 oz) and a female 51 g (1.8 oz). The adult male's upperparts are sooty black with fine reddish cinnamon spots and bars. Much of the face is also reddish cinnamon. The central tail feathers are sooty black with reddish cinnamon bars; the outer three pairs have wide white tips and less barring. The wings are blackish with reddish cinnamon bars. The throat and breast are sooty black with scattered white spots and have a narrow band of white and buff separating them. Voice: The male dusky nightjar's song is "a trilled, double-noted whistle prurrr prureee or prurrrr prruwhip". It is sung mostly during the breeding season, from a perch and rarely from the ground, and may be sung throughout moonlit nights. A flight call is described as "a scratchy wheer."
ID text from Wikipedia, CC BY-SA 4.0
Mexican Whip-poor-will
Antrostomus arizonae
The Mexican whip-poor-will is 23 to 24 cm (9.1 to 9.4 in) long and weighs 45 to 50 g (1.6 to 1.8 oz). In general its upperparts are grayish brown with blackish brown streaks; the crown has wide blackish brown stripes. The throat and breast are blackish with a thin white band on the lower throat between them. The belly is buff with brown bars. The male's outermost three pairs of tail feathers have broad white tips; the female's are narrower and buffy. The wings are brown with tawny and buff spots and speckles. The subspecies differ somewhat. Voice: The Mexican whip-poor-will is more often heard than seen. Its song is an onomatopoeic whip-poor-will like that of its eastern congener, but lower in pitch and "less 'snappy' and slightly 'lazier'". It also makes a variety of other sounds including "a single, low, mellow quirt or queerp note", a growl, and a "growl-chuck".
ID text from Wikipedia, CC BY-SA 4.0

Learn this pair in the BeakBrain App
Photo and call practice. Coming soon to iPhone and Android.
Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Dusky Nightjar and Mexican Whip-poor-will.