Figure 2.

Choices of female grey treefrogs in tests of compound calls versus normal-duration advertisement calls alone. (a) Proportions of females (n=32 females per test) of H. versicolor and H. chrysoscelis choosing compound calls in tests in which appendages followed advertisement calls. Filled symbols, H. versicolor females; open symbols, H. chrysoscelis females; circles, advertisement-call appendages; squares, aggressive-call appendages; triangles, noise-burst appendage; stars, control compound calls (see text). (b) Results of tests in which the appendage led the advertisement call. The 95% exact confidence limits were computed using the F-distribution method employed in SAS v. 11.1, and hence are not always symmetrical around the observed proportion. We interpret them as Bayesian credible intervals (uniform prior distribution).