Interesting. The Wallace Line (and Lydekker’s Line) are geographic boundaries that separate different species. Now it may turn out that one species that spans those lines, the common Olive-backed Sunbird, may be different species separated by those lines.

https://www.linnean.org/news/2022/11/21/finding-sunbird-species-in-wallacea

#Evolution #Birds #Sunbirds #WallaceLine #LydekkerLine #Geography #Boundaries

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