ScienceDaily reports
Higher seed set in hummingbird-pollinated species than in bee-pollinated species
Why have some plant species changed pollinators in their evolution? An international team of researchers studied the reproductive systems of three sister species pairs, where one species is pollinated by insects and the other by hummingbirds. Mechanisms were discovered that explain the switch from insect to bird pollination.
naturalhistorywanderings.com 
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