- This dataset is used as working example in Nabholz, Fuchs and Lanfear. A body-mass corrected molecular rate for bird mitochondrial DNA. - It is originally from Oatley G, Simmons RE, Fuchs J (2015) A molecular phylogeny of the harriers (Circus, Accipitridae) indicate the role of long distance dispersal and migration in diversification. Molecular Phylogenetics and Evolution, 85, 150–160. - Files basem_3rd_codon_position.ctl and baseml_all_position.ctl are control files for BASEML program. - Circus.tree is the tree file following the results of Oatley et al. 2015. - Circus_clock_all_position.tree and CircusND1_clock_3rd.tree are the tree files obtaines from BASEML analyses. - Circus_3rd_codon_position.phy and Circus_all_position.phy are the alignments of the third-codon positions and all the codon position respectively. - To replicate the molecular dating analysis: 1) Use BASEML to estimate the branch length 2) Extract the tree file from the outfile of BASEML 3) Use the R script applyMassCorrectedRates.R to convert the branch length in divergence dates. applyMassCorrectedRates.R could be edited (for example, using Rstudio) or, alternatively, it could be use in command line as followed: Rscript applyMassCorrectedRates.R 507 Name_of_BASEML_Tree_files.tree Note: All the files were generated with linux computer (ubuntu 14.02). Be aware of potential files format problem between operating system.