If a North American observer records... | The bird in question might have been... ------------------------ | ------------------------------------- "Gull sp." | Any local member of the genera Larus, Chroicocephalus, or Leucophaeus "Tern sp." | Any local species whose common name includes "Tern" (because the family-level taxonomy has changed since these observations were taken) "Woodpecker sp." | Any local member of the woodpecker family (Picidae) "Raven sp." | Any local species listed at https://en.wikipedia.org/wiki/Raven "Crow sp." | Any local member of the genus Corvus
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