In this Feb. 20, 2014 photo, Luke Ellsbury, left, of the Wyoming Game & Fish Department large carnivore biologist and Cole Hansen, Game & Fish wildlife biologist, prepare a tranquilized bighorn ewe for transport to a waiting horse trailer, where she will be examined, near the North Fork of the Shoshone River west of Cody, Wyo. The Wyoming Game & Fish Department and others are endeavoring to ascertain why bighorn sheep in the Cody region are doing well despite pathogens that can cause disease. (AP Photo/The Powell Tribune, Gib Mathers)
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