Seeing Is Feeding for the Frugivorous Bird Brown-Eared Bulbul (Microscelis amaurotis)

Figure 3

The probability of pecking the clear part of a two-part bag, with half clear and half white. Fruits were covered with half-clear bags in which the upper or lower half was opaque (half-visible bag; see Figure 1). The probabilities were estimated as pecking counts on the clear part divided by the total pecking count. The -axis shows the treatment; “upper vis.” and “lower vis.” mean that the upper or lower half part was the clear part, through which fruit were visible. Error bars indicate 95% confidence intervals (GLMM; error distribution: binomial).