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Pika, S.; Bugnyar, T.: The use of referential gestures in ravens (Corvus corax) in the wild. Nature Communications 2, 560 (2011)

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Reers, H.; Jacot, A.; Forstmeier, W.: Do zebra finch parents fail to recognise their own offspring? PLoS One 6 (4), e18466 (2011)