Concept
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Charles Darwin and Natural Selection
Beak Shape Among Finch Species
Darwin observed that beak shape varies among finch species. He postulated that the beak of an ancestral species had adapted over time to equip the finches to acquire different food sources.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Understanding Evolution. January 16, 2015."
http://cnx.org/content/m44568/latest/
OpenStax CNX
CC BY 3.0.