The homogenization of avian morphological and phylogenetic diversity under the global extinction crisis.

We calculated the mean distance to centroid of morphospace 20 across morphospace for all bird species, where species from each IUCN threatened category were dropped (critically endangered [CR] > endangered [EN] > vulnerable [VU] > near threatened [NT]) and found a weak trend of species tending to be closer to the center of morphospace ( Figure 1 ).

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