Figure 3
From: Formants provide honest acoustic cues to body size in American alligators

The spacing between the first two formants F1F2 (upper panels) was strongly inversely correlated with size in water (a) and on land (b) for both sexes. The dominant frequency (lower panels) showed no correlation with size in water (c) but correlated weakly for bellows produced on land (d). (size represented with DCL, drawings by S.R.).