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  1. Passerine - Wikipedia

  2. Passeriform | Families, Species, & Characteristics | Britannica

  3. Passerine - Simple English Wikipedia, the free encyclopedia

  4. Passerine - New World Encyclopedia

  5. Passeriform - Flight, Adaptations, Foraging | Britannica

  6. Songbird | Types, Characteristics & Behavior | Britannica

  7. Perching Birds: Passeriformes | Encyclopedia.com

  8. Passeriformes - Animalia

  9. Phylogeny and Evolution of the Passerine Birds | BioScience

  10. Passerines and Songbirds - Stanford University

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