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. 2012 Jul 5;367(1597):1811–1828. doi: 10.1098/rstb.2011.0215

Figure 1.

Figure 1.

Factors predicting variations in signal complexity in (a) frogs, (b) distantly related birds, (c) distantly related agamid lizards and (d) closely related Sceloporus lizards. The arrows in (a) highlight outliers not included in the computation of the trend line depicted in the plot.