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Fig. 1. Attraction of A. variegatum to rumen fluid odour. Polar plots of
the mean walking direction of 18 A. variegatum adults presented in
three successive 1 min intervals with (A) a control air stream (0°), (B)
rumen fluid odour in the air stream and (C) the control air stream (without
rumen fluid) again. Ticks that spent more time walking in the cone delimited
by 60° either side of upwind (in red) after presentation of the rumen
odour were considered to be attracted. (D) A track described by an A.
variegatum adult in the same experiment; the track started (filled
circle) with the tick walking down or across wind in the control period; the
arrows on the track indicate stimulus on and off; the bar represents a
displacement of 20 cm. Note the local search behaviour induced in A.
variegatum by withdrawal of the rumen odour from the air stream. Open
arrow at bottom indicates airstream direction (0°) for A,B,C and D.
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