Learned from this observation: https://www.inaturalist.org/observations/73373704
Non-breeding plumage looks very similar between the species. Tail tip is barred and wingtips are black for Bar-tailed Godwit, while wingtips and tail tip are all black for Black-tailed Godwit.
Black-tailed Godwit (black wing tips):
Image by Andrew Thompson from observation https://www.inaturalist.org/observations/73426202
Image by Анна Голубева from observation https://www.inaturalist.org/observations/72916471
Bar-tailed Godwit (barred wing tips):
Image by Graham Winterflood from observation https://www.inaturalist.org/observations/73373704
Image by leo_in_merimbula from observation https://www.inaturalist.org/observations/73088962
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