Editing Hummingbird (section)

===Geographic diversification===
The Andes Mountains appear to be a particularly rich environment for hummingbird evolution because diversification occurred simultaneously with mountain uplift over the past 10 million years.<ref name="sd"/> Hummingbirds remain in dynamic diversification inhabiting ecological regions across South America, North America, and the Caribbean, indicating an enlarging [[evolutionary radiation]].<ref name="sd"/>

Within the same geographic region, hummingbird clades coevolved with nectar-bearing plant clades, affecting mechanisms of [[pollination]].<ref>{{Cite journal |author1=Abrahamczyk, S. |author2=Renner, S.S. |year=2015 |title=The temporal build-up of hummingbird/plant mutualisms in North America and temperate South America |journal=BMC Evolutionary Biology |volume=15 |issue=1 |page=104 |doi=10.1186/s12862-015-0388-z |pmc=4460853 |pmid=26058608 |doi-access=free |bibcode=2015BMCEE..15..104A }}</ref><ref>{{Cite journal |author1=Abrahamczyk, S. |author2=Souto-Vilarós, D. |author3=McGuire, J.A. |author4=Renner, S.S. |year=2015 |title=Diversity and clade ages of West Indian hummingbirds and the largest plant clades dependent on them: a 5–9 Myr young mutualistic system |url=https://zenodo.org/record/890511 |journal=Biological Journal of the Linnean Society |volume=114 |issue=4 |pages=848–859 |doi=10.1111/bij.12476}}</ref> The same is true for the [[sword-billed hummingbird]] (''Ensifera ensifera''), one of the morphologically most extreme species, and one of its main food plant clades (''Passiflora'' section ''Tacsonia'').<ref>{{Cite journal |last1=Abrahamczyk |first1=S. |last2=Souto-Vilaros |first2=D. |last3=Renner |first3=S. S. |year=2014 |title=Escape from extreme specialization: Passionflowers, bats and the sword-billed hummingbird |journal=Proceedings of the Royal Society B: Biological Sciences |volume=281 |issue=1795 |pages=20140888 |doi=10.1098/rspb.2014.0888 |pmc=4213610 |pmid=25274372}}</ref>