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http://en.wikipedia.org/wiki/Pygoscelis_adeliae.
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http://animaldiversity.ummz.umich.edu/accounts/Pygoscelis_papua/.
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http://genomics.senescence.info/species/entry.php?species=Pygoscelis_papua.
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Kooijman, S. (2010).
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Prinzinger, R., A.Preßmar, and Schleucher, E. (1991).
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Volkman, N. J. and Trivelpiece, W. (1980).
Growth in pygoscelid penguin chicks.
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