Datasets and scripts related to the manuscript "What makes the diverse flight of birds possible? Phylogenetic comparative analysis of avian alula morphology"

"alula_data187.csv" and "alula_data162.csv" include the two duck sister species, Anas platyrhynchos and A. poecilorhyncha. The former lacks the migratory distance, while the latter contains the variable. "alula_data185.csv" and "alula_data160.csv" are similar to "alula_data187.csv" and "alula_data162.csv", respectively, but exclude the two duck species. "alula_data151.csv" and "alula_data130.csv" are similar to "alula_data185.csv" and "alula_data160.csv", respectively, but further exclude species based on female specimens. "consensus187.tre" is the consensus tree used for the phylogenetic comparative analyses. "scripts.txt" includes two R scripts for (1) calculating the migratory distance and (2) the phylogenetic comparative analyses.