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Passerine - Wikipedia
Passeriform | Families, Species, & Characteristics | Britannica
Passeriform - Flight, Adaptations, Foraging | Britannica
Passerine - Simple English Wikipedia, the free encyclopedia
Passerine - New World Encyclopedia
Passeriformes - Animalia
Perching Birds: Passeriformes | Encyclopedia.com
perching birds - Encyclopedia of Life
Phylogeny and Evolution of the Passerine Birds - Oxford Academic
Passeriform - Songbirds, Perching, Taxonomy | Britannica