Peponapis pruinosa is a species of bee in the tribe Eucerini, the long-horned bees. This bee relies on wild and cultivated squashes, pumpkins, gourds, and related plants. Wikimedia/USDA hide caption

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A bison herd with calves travels through Lamar Valley, Yellowstone National Park. The park has proposed a cull of 1,000 bison, primarily cows and calves, this winter. Neal Herbert/National Park Service/Flickr hide caption

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AquaBounty's salmon (rear) have been genetically modified to grow to market size in about half the time as a normal salmon — 16 to 18 months, rather than three years. MCT /Landov hide caption

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In this Aug. 2014 photo, a chimp sits in a tree at Chimp Haven sanctuary in Keithville, La. Brandon Wade/AP Images for The Humane Society of the United States and Chimp hide caption

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A Butterball turkey for sale in November 2014, in Centreville, Va. Terms like "premium" and "raised without hormones" tell you little about the quality of the turkey or how it was raised. Paul J. Richards/AFP/Getty Images hide caption

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An illustration of rinderpest in the Netherlands in the 18th century. Europeans once feared the cattle virus as much as they did the Black Death. Jacobus Eussen/Wikimedia Commons hide caption

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