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  1. Melanie

    What is Regulus cuvieri?

    There are several Regulus species in North America, but there was never a study which shed a light on the real identity of Audubon's mysterious bird. The question is, why?
  2. Melanie

    What is Regulus cuvieri?

    Why it is so difficult to identify Regulus cuvieri (known from a plate in Audubon's Birds of America)?
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