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Fig. 3. Time spent by chicks in the choice arms when presented with a simultaneous
choice between a pecking robot and a static model of a conspecific (A) or
between pecking and scanning robots (B). Values represent percentages of the
time that chicks spent in both choice arms. The median is shown by the bold
line, lower bars show 1st quartiles (in this case identical to the median) and
upper bars show 3rd quartiles. Whiskers indicate smallest and largest
value.