Abslracl l-he origin of queen attractivily in the Argentine ant was estimated by presenting body parts (head, thorax, abdomen) of dead queens t(~ workers. Whatever the preparation, crushed or intact, the thorax was always significantly more altractiw ~ Ihan ~|her parts ~f the body. The legs seemed to be highly attractive to the workers, mainly through h~clile stimuli. The results are discussed with regards to the occurrence of thoracic gland:~.K~,y word.s: Aggregation fact()r; Argentine ant; Iridomyrmex' humilis; C).uoen altra(livily
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