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Beauty Is in the Genes of the Beholder
An American pronghorn male defending his harem has spotted a rival and is running to chase him away.
Credit: John Byers, Department of Biological Sciences, University of Idaho
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A solitary American pronghorn male on the National Bison Range in western Montana in September.
Credit: John Byers, Department of Biological Sciences, University of Idaho
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A group of pregnant American pronghorn females on the National Bison Range in May. Note the ear tags that uniquely identify each individual.
Credit: John Byers, Department of Biological Sciences, University of Idaho
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An American pronghorn male defends a small harem of two females in September.
Credit: John Byers, Department of Biological Sciences, University of Idaho
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In October, near the end of the period of sexual excitement and reproductive activity, American pronghorn males abruptly begin to tolerate each other.
Credit: John Byers, Department of Biological Sciences, University of Idaho
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At the end of the estrus in October, females feed voraciously to regain energy that they've lost in the mate sampling period.
Credit: John Byers, Department of Biological Sciences, University of Idaho
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