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Mean ± SE activity of male Sceloporus lizards in each clade, as measured by the number of behavioural acts per minute (i.e. summing bouts of locomotion, motion displays and chemical behaviour; Fig. 2). Black bars: males with colourful belly patches (Clade A: S. parvus; Clade B: S. merriami); white bars: males lacking colourful belly patches (Clade A: S. cozumelae; Clade B: S. siniferus).
