Hybridization can cause two species to fuse into a single population. New observations suggest that two species of Darwin's finches are hybridizing on a Galapagos island, and that a third one has disappeared through interbreeding.
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Grant, P., Grant, B. Speciation undone. Nature 507, 178–179 (2014). https://doi.org/10.1038/507178b
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DOI: https://doi.org/10.1038/507178b
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