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  1. Aptera in the 10th edition of Systema Naturae - Wikipedia

  2. APTERA: The Wingless Wonders of the Insect World - Buglore

  3. Birds or Class Aves – Description and Characteristics

  4. Aptera - Encyclopedia

  5. Bird - Aves, Species, Orders | Britannica

  6. ADW: Aptera: CLASSIFICATION

  7. ADW: Aves: CLASSIFICATION

  8. Avian Physiology: Are Birds Simply Feathered Mammals?

  9. Aves: Characteristics and Classification - The Science Notes

  10. ADW: Aptera fusca: CLASSIFICATION