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♦ ¹National Geographic Magazine - May 2016 - Yellowstone - The Carnivore Comeback
♦ ²Botanical composition of the diets of alpaca (Lama pacos) and llama (Lama glama) in the Andean rangelands of Chile, Birgit Wackwitz, G. Castellaro, H. J. Schwartz, A. Raggi, Deutscher Tropentag 1999 in Berlin, Session: Sustainable Technology Development in Animal Agriculture