Grünbürzel-Sperlingspapagei (German Wikipedia)

Analysis of information sources in references of the Wikipedia article "Grünbürzel-Sperlingspapagei" in German language version.

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Virginia Morell: Why Do Parrots Talk? Venezuelan Site Offers Clues. In: Science. Band 333, Nr. 6041, 2011, S. 398–400, doi:10.1126/science.333.6041.398.
Karl S. Berg et al.: Vertical transmission of learned signatures in a wild parrot. In: Transactions of the Royal Society B. Band 279, Nr. 1728, 2012, S. 585–591, doi:10.1098/rspb.2011.0932.