Nectar foraging efficiency was related to decision speed during the final 30 choices of training, i.e., no predation risk (A), and a combination of decision accuracy (B) and decision speed (C) during the final 30 choices of testing, i.e., under predation threat. In all panels, nectar collection rates of bees from each group are shown by different symbols (conspicuous spider = open circles; cryptic spider = grey triangles; quinine = solid black squares). (A) The lines represent predicted values from a significant linear regression model (R2 = 0.481, F1,36 = 11.13, P < 0.001) with a common slope but different intercepts for each group (conspicuous spider = black dotted line; cryptic spider = dashed grey line; quinine = solid black line. (B) Individual nectar collection rates during the testing phase are shown against decision accuracy and the black solid line represents predicted values from the linear regression (nectar collection rate ∼decision accuracy + decision speed; R2 = 0.185, F1,13 = 8.63, P = 0.006 ) with values for speed set at the group mean value. (C) Nectar collection rates are plotted against decision speed and the black solid line represents predicted values from the same linear regression as in (B) but with values for accuracy set at the group mean value. In all cases, the regression lines are not extrapolated beyond observed values.