We usually think of a species as being reproductively isolated -- that is, not mating with other species in the wild. Occasionally, however, closely related species do interbreed. New research documents the existence of a previously undiscovered hybrid zone along the coasts of California and Oregon where two related bird hummingbirds are blurring species boundaries, and researchers hope that studying cases such as this one could improve their understanding of how biodiversity is created and maintained.
from Latest Science News -- ScienceDaily https://ift.tt/31tstTf
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