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Number of (a) first landings and (b) first probings exhibited by bumble bees (open bars, unoccupied inflorescences (U); filled bars, occupied inflorescences (O)) when bees were presented with Abelia (familiar flower species, left two bars), and when they were presented with Kalanchoe (unfamiliar flower species, right two bars). The p-values in parentheses are obtained from two-tailed binomial tests.
