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Voelkl, Bernhard; Portugal, Steven J.; Unsöld, Markus; Usherwood, James R.; Wilson, Alan M.; Fritz, Johannes (2015). Matching times of leading and following suggest cooperation through direct reciprocity during V-formation flight in ibis. Proceedings of the National Academy of Sciences of the United States of America - PNAS, 112(7), pp. 2115-2120. National Academy of Sciences NAS 10.1073/pnas.1413589112
