Exploring how birds use contractions NatureComms
) combine alert and recruitment calls into alert-recruitment call sequences alert-recruitment call sequences broadcast from a single speaker and alert calls and recruitment calls broadcast from two speakers in turn, following the alert-recruitment order .
If an animal uses core-Merge to perceive call sequences, then it should be able to assess whether the component calls are produced from the same spatial location, as well as whether they are temporally linked into naturally ordered sequences.
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