Least Nighthawk
Chordeiles pusillus
The least nighthawk is 15 to 25 cm (5.9 to 9.8 in) long, making it one of the smallest species in family Caprimulgidae. Two females weighed 27.8 and 33.4 g (0.98 and 1.18 oz) The general plumage pattern is brown upperparts with gray, rufous, and buff spots, and whitish or buff underparts with brown bars. The throat has a narrow white patch or small white patches on either side of it. The four outermost primaries have a white band that is highly visible in flight. Males also have white tips on some other wing feathers. Voice: The least nighthawk's flight call has been variously described as "a low churr and a weak nasal beep or week" and as "a short, sharp whit or bit". It sings from the ground or a bush, "a fast cur-cur-cur-curry (or chu-chu-chu-chu-chuEE).
ID text from Wikipedia, CC BY-SA 4.0
Nacunda Nighthawk
Chordeiles nacunda
The nacunda nighthawk is not only the largest of the highly aerial nightjars known as nighthawks and the largest species of nightjar in the neotropics, it is one of the largest nightjar species in the world. Its length, at 27.5 to 32 cm (10.8 to 12.6 in), is somewhat less than the great eared-nightjar, which is typically considered the largest species in the family, but the nacunda may actually weigh a bit more on average. Six specimens of nacunda nighthawk were found to average 159 g (5.6 oz) in body mass, with range of 130 to 188 g (4.6 to 6.6 oz).
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Least Nighthawk and Nacunda Nighthawk.