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The Chatham duck (Pachyanas chathamica) represented one of just three modern bird genera endemic to the Chatham archipelago (situated ∼850km east of New Zealand) but became extinct soon after humans first settled the islands (c. 13th–15th centuries AD). The taxonomic affinity of the Chatham duck remains largely unresolved; previous studies have tentatively suggested placements within both Tadornini...
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