Chimney Swift
Chaetura pelagica
This is a medium-sized swift, measuring from 12 to 15 cm (4.7 to 5.9 in) in length, with a wingspan of 27 to 30 cm (11 to 12 in) and a weight ranging from 17 to 30 g (0.60 to 1.06 oz). The sexes are identical in plumage, though males average slightly heavier than females. The adult's plumage is a dark sooty olive above and grayish brown below, with a slightly paler rump and uppertail covert feathers, and a significantly paler throat. Its upperparts are the most uniformly colored of all the Chaetura swifts, showing little contrast between back and rump. Voice: The chimney swift has a twittering call, consisting of a rapid series of hard, high-pitched chirps. It sometimes gives single chirps.
ID text from Wikipedia, CC BY-SA 4.0
Sick's Swift
Chaetura meridionalis
The upperparts dark smoky brown. The tail is ashy grey with dark shafts and protruding spines, The throat is grey, lower underparts dark brown, bill and legs black.
ID text from Wikipedia, CC BY-SA 4.0
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