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Passerine - Wikipedia
Passeriform | Families, Species, & Characteristics | Britannica
Passerine - Simple English Wikipedia, the free encyclopedia
Passerine - New World Encyclopedia
Passeriform - Flight, Adaptations, Foraging | Britannica
Songbird | Types, Characteristics & Behavior | Britannica
Perching Birds: Passeriformes | Encyclopedia.com
Passeriformes - Animalia
Phylogeny and Evolution of the Passerine Birds | BioScience
Passerines and Songbirds - Stanford University
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