Aves (Portuguese Wikipedia)

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Gargallo, Gabriel (1 de junho de 1994). «Flight Feather Moult in the Red-Necked Nightjar Caprimulgus ruficollis». Journal of Avian Biology. 25 (2): 119–24. JSTOR 3677029. doi:10.2307/3677029
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Gionfriddo, James P. (1 Fevereiro de 1995). «Grit Use by House Sparrows: Effects of Diet and Grit Size» (PDF). Condor. 97 (1): 57–67. doi:10.2307/1368983
Battley, Phil F.; Piersma,T; Dietz, MW; Tang, S; Dekinga, A; Hulsman, K (Janeiro de 2000). «Empirical evidence for differential organ reductions during trans-oceanic bird flight». Proceedings of the Royal Society B. 267 (1439): 191–5. PMC 1690512. PMID 10687826. doi:10.1098/rspb.2000.0986
Balgooyen, Thomas G. (1 de outubro de 1971). «Pellet Regurgitation by Captive Sparrow Hawks (Falco sparverius)» (PDF). Condor. 73 (3): 382–85. JSTOR 1365774. doi:10.2307/1365774. Consultado em 22 de fevereiro de 2016. Cópia arquivada (PDF) em 24 de maio de 2013
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