Cook's swift is a small bird, superficially similar to a house martin. It is, however, completely unrelated to those passerine species, since swifts are in the order Apodiformes. The resemblances between the groups are due to convergent evolution reflecting similar life styles.
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Low-Light Telephoto Systems
Identifying specific features of the Cook's Swift requires high-contrast magnification. Check out the top-rated 8x42 optics.