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How old is the oldest known psittaciform fossil?

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Illustration of a rock parakeet (Pyrrhura rupicola) perched on a branch, showing green plumage with scalloped markings, a patch of red on the wing, and a dark beak. — Psittaciform Black-capped parakeet (*Pyrrhura rupicola*).

The oldest known fossil of a psittaciform (parrot) is a humerus bone discovered in Denmark that dates to approximately 55 million years ago, during the Eocene Epoch.1