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Plotopterids (Aves: Plotopteridae) are extinct flightless birds that were endemic to the North Pacific Ocean. As flightless, wing‐propelled diving birds they exhibit similar skeletal morphology to Sphenisciformes (penguins), especially in their wings. In contrast to the similarity, Plotopteridae have been placed in (traditional) Pelecaniformes in most palaeontological and phylogenetic studies, based...
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