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Mean ± SE (a) number of full-shows (up-and-down motions) and (b) total number of headbobs/display for male Sceloporus lizards in each clade. 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).
