Figure 2. Percentage of calling activity level measured as Amphibian Calling Index (ACI) for eight species of Eleutherodactylus frogs from Puerto Rico.

White bars represent ACI, 0 (no individuals calling); diagonal lines represent ACI, 1 (a few individuals calling with no overlap); gray bars represent ACI, 2 (there is some overlap); and black bars represent the percentage of samples with ACI, 3 (full chorus).