Abstract
The cues used for orientation on chemical trails by laboratory colonies of Atta cephalotes, Atta laevigata and Acromyrmex octospinosus were studied. The ants used cues other than the odour trail itself when homing. When cues gave contradictory information, Atta workers used them in a certain hierarchy: presence of an odour trail, visual cues or spatial layout of the trail, ‘odour cues’ on the trail and gravitational cues. Acromyrmex octospinosus seemed to have a different hierarchy, giving more importance to odour cues on the trail. The possible nature of the ‘odour cues’ on the trail is discussed.
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