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Figure S1 Phylogeny based on Barker et al. (2004) with Grafen's (1989) branch lengths.

Figure S2 Phylogeny based on Jønsson & Fjeldså (2006) with Grafen's (1989) branch lengths.

Tables S1–S3 Results of PGLS models using different phylogenies and branch lengths run on species averages of male's relative incubation effort (power-2 transformed) fitted in caper package.

Tables S4–S7 Results of PGLS models using different phylogenies and branch lengths run on population-level values of male's relative incubation effort (power-2 transformed) fitted in caper package.

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