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Fig. 1. Stacked column of courtship-related behaviours shown by males in the
presence of an accessible female and in the presence of an inaccessible
female. Twelve male–female pairings were used, and each animal was used
in both the accessible and inaccessible conditions. The number of animals
showing courtship stationary paddling was significantly different between the
accessible and inaccessible conditions (*P<0.01, Sign
test). There was no significant difference in total courtship behaviour
(Cradle carry + Courtship paddling) between the accessible and inaccessible
conditions (NS, not significant P=0.48, Sign test).