Parrot (English Wikipedia)

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Mellor, Emma L.; McDonald Kinkaid, Heather K.; Mendl, Michael T.; Cuthill, Innes C.; van Zeeland, Yvonne R. A.; Mason, Georgia J. (6 October 2021). "Nature calls: intelligence and natural foraging style predict poor welfare in captive parrots". Proceedings of the Royal Society B: Biological Sciences. 288 (1960). doi:10.1098/rspb.2021.1952. PMC 8493207. PMID 34610768.
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Wright, T.F.; Schirtzinger E. E.; Matsumoto T.; Eberhard J. R.; Graves G. R.; Sanchez J. J.; Capelli S.; Muller H.; Scharpegge J.; Chambers G. K.; Fleischer R. C. (2008). "A Multilocus Molecular Phylogeny of the Parrots (Psittaciformes): Support for a Gondwanan Origin during the Cretaceous". Molecular Biology and Evolution. 25 (10): 2141–56. doi:10.1093/molbev/msn160. PMC 2727385. PMID 18653733.
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