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. 2021 May 17;118(21):e2023170118. doi: 10.1073/pnas.2023170118

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Copyright © 2021 the Author(s). Published by PNAS.

This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY).

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Fig. 4. — (A) The distribution of the number of individual birds, calculated by summing all species-specific abundance distributions (e.g., Fig. 2B) categorized within specific biogeographic realms (N = 9,178 species). (B) The SAD for each biogeographic realm, in which each species’ median abundance estimate is used. (C) The distribution of the number of individual birds, calculated by summing all species-specific abundance distributions (e.g., Fig. 2B) categorized within specific feeding guilds (N = 9,157 species). (D) The SAD for each feeding guild, in which each species’ median abundance estimate is shown. Species’ classifications were taken from ref. 54. The feeding guild of scavenger is not shown because very few species were assigned as scavenger.