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Unformatted text preview: identify them at one point banded every finch on the island (over 1000). Know histories of all the birds. Darwin: 5 years of the Beagle, under Captain Fitzroy. Object of the mission: continue survey of S. America region and Tiara Del Fuego. Evolution = natural selection + genetics (variation) Darwin thought it takes millions of years; Grants prove it doesnt. Hybridizing: mating with large and small beak species. Results in the medium ground finch to have greater variety of beaks. Recently: up to 50% of the birds dying. Due to starvation, lack of rain = lack of food. Not as bad as drought in 1977 no rain for over 500 days. By sampling seeds they could tell which seeds were disappearing and which seeds the birds were turning to. small beaked birds couldnt crack the remaining large seeds, large beaked birds survived. Natural selection operates under extreme conditions....
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This note was uploaded on 03/23/2008 for the course ANTH 148 taught by Professor Sorensen during the Fall '08 term at UNC.
- Fall '08