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Fig. 2. (A–E) Choice frequencies (CFs) in favour of the positive shape (inset in each panel) obtained using solid black shapes presented against a white background. Black columns, Megachile rotundata; hatched columns, Apis mellifera. Asterisks denote the level of significance against random-choice expectation (CF=50 %, dashed lines) ({chi}2-tests). ***P<0.001; **P<0.025; *P<0.05. NS, not significant. Numbers above columns denote the total number of choices.