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
Vaux's Swift
Chaetura vauxi
This is a small swift, even compared to other Chaetura species, at 10.7 to 11.2 cm (4.2 to 4.4 in) long and weighing 18 g (0.63 oz). The northern populations are slightly larger at 11.5 cm (4.5 in), probably according to the Bergmann's Rule and/or migration requirements. It has a cigar-shaped body, crescentic wings and a short bluntly squared-off tail. The head, upperparts and wings are dusky black, and the underparts, rump and tail coverts are greyish brown. The throat is paler grey, becoming whitish in northern birds.
ID text from Wikipedia, CC BY-SA 4.0
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