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Fig. 1. `Goal expansion' and `error compensation' strategies. Feeders (F) were
surrounded by target circles painted on the desert floor, as shown for three
nest-feeder distances D. The target circles were used for recording
the ants' downwind approach distances d. The ants' approach towards
the feeder may be governed by two alternate strategies: expectation according
to the `error compensation strategy' (solid line) and expectations according
to the `goal expansion strategy' (dashed lines; for details see text).
Downwind angle 
is indicated for comparison with d; at 20 m
nest-feeder distance, a schematic distribution of approach distances is
illustrated, typical of, although narrower than, those recorded in the present
experiments (compare Fig.
4).
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