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  1. nartreb

    Great-tailed or Boat-tailed Grackle? Nolton Haven, Pembrokeshire, Wales.

    This is a difficult pair to separate, US birders generally rely on location. In the area where they overlap, they differ in eye color, but that doesn't help us in the case of vagrants (ship-borne or otherwise), since both species can have yellow eyes as seen here. Another field mark is that...
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