Features of collective behaviour

Collective behavior involves spontaneous and unstructured actions by ______ ______ ______ ____ _________.
_______ ____ ________ ________ ____.
________ ______ ____ ______ __________ __________ ________ ______ _________ ____.
________ __________ _______ _________ ___ _____ __________ __________ ______.
_____ ______ ______ __________ _____ ______ __________ ___.
___ __________ ____.
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