Butterfly tree of life reveals an origin in North America – Research News
Spatial phylogenetics of butterflies in relation to environmental drivers and angiosperm diversity across North America - ScienceDirect
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The U.S. Geological Survey wants you to send in dead butterflies for research : NPR
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PDF) A global phylogeny of butterflies reveals their evolutionary history, ancestral hosts and biogeographic origins
Butterfly tree of life reveals an origin in North America