List of global birds with ED scores and zoo holding data

We calculated "evolutionary distinctness" (ED) scores using an updated distribution of phylogenies incorporating a total of 10, 284 extant bird species as recognized by the IUCN, based on the distribution of "Hackett backbone" trees used by Jetz et al. [2014]. The ED metric was first presented by Redding [2003], (also known as the "Fair Proportion" measure), and sums the lengths of the branches on the path from a species to the root, with each branch length inversely weighted by the number of living species that ultimately descend from it. Next we compiled a list of all species indicated as being held in captivity by the Zoological Information Management System (ZIMS): the largest database regarding ex-situ holdings from 960 institutions worldwide [Species 360, 2016]. A species was scored as being in a zoo if there was a record of at least one individual being held ex-situ in the ZIMS database up to March 2016. Software used was R. This dataset was originally deposited in the Simon Fraser University institutional repository.