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      Experimental evidence for compositional syntax in bird calls

      Nature Communications
      Springer Nature

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          Allometry of alarm calls: black-capped chickadees encode information about predator size.

          Many animals produce alarm signals when they detect a potential predator, but we still know little about the information contained in these signals. Using presentations of 15 species of live predators, we show that acoustic features of the mobbing calls of black-capped chickadees (Poecile atricapilla) vary with the size of the predator. Companion playback experiments revealed that chickadees detect this information and that the intensity of mobbing behavior is related to the size and threat of the potential predator. This study demonstrates an unsuspected level of complexity and sophistication in avian alarm calls.
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            Language evolution: semantic combinations in primate calls.

            Syntax sets human language apart from other natural communication systems, although its evolutionary origins are obscure. Here we show that free-ranging putty-nosed monkeys combine two vocalizations into different call sequences that are linked to specific external events, such as the presence of a predator and the imminent movement of the group. Our findings indicate that non-human primates can combine calls into higher-order sequences that have a particular meaning.
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              Pseudoreplication in playback experiments, revisited a decade later

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                Journal
                10.1038/ncomms10986

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