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Temporal range: Late Eocene
The relationships between falcons and other birds of prey (such as hawks and eagles) are not resolved to satisfaction. Horusornis may have been a "missing link" uniting falcons, hawks, and the secretarybird. If falcons are more distantly related to other birds of prey, the horusornithids would rather be basal relatives of hawks that somewhat resembled falcons due to convergent evolution.
- Haaramo, Mikko (2005): Mikko's Phylogeny Archive: Accipitridae. Version of 2005-NOV-15. Retrieved 2007-MAY-17.
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