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. 2014 Jun 9;6:ecurrents.tol.c1af68dda7c999ed9f1e4b2d2df7a08e. [Version 1] doi: 10.1371/currents.tol.c1af68dda7c999ed9f1e4b2d2df7a08e

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This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Distribution of source trees by year of publication. — The number of avian phylogenies published, and included in the supertree analysis, is heavily skewed towards recent years with relatively few trees from pre-1995.