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Tandem running of ant (Leptothorax acervorum). (Top to bottom) Recruiting worker assumes calling position; nestmate arrives and touches the gaster and hindlegs of the calling ant with its antennae; and calling ant lowers its gaster and tandem running starts. The sting of the recruiting ant remains extruded, but it is not dragged over the surface. See page 1046. [Michael Möglich, Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts]


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Science. ISSN 0036-8075 (print), 1095-9203 (online)