To Charles Darwin, evolution through natural selection occurred over countless generations. To Charles Brown, a University of Tulsa biology professor, natural selection took place literally overnight in 1996 as he witnessed the starvation death of half the cliff swallows he has studied in Nebraska for 17 years.
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University Of Tulsa. "TU Biologist Sees Darwinian Selection In Action." ScienceDaily. ScienceDaily, 26 October 1998. <www.sciencedaily.com/releases/1998/10/981026195313.htm>.
University Of Tulsa. (1998, October 26). TU Biologist Sees Darwinian Selection In Action. ScienceDaily. Retrieved March 11, 2014 from www.sciencedaily.com/releases/1998/10/981026195313.htm
University Of Tulsa. "TU Biologist Sees Darwinian Selection In Action." ScienceDaily. www.sciencedaily.com/releases/1998/10/981026195313.htm (accessed March 11, 2014).