The alpine peaks of the Sierra Nevada Mountains in 2008.
David McNew/Getty Images
February 14, 2013 Judy Van der Veer poured her experiences of living on a California ranch into books evoking the delights and sorrows of the natural world. On Valentine's Day, commentator Barbara J. King shares her love for Van der Veer's writing.
Cattle and zebra share a meal in a pasture in Kenya.
Ryan Lee Sensenig/Science
September 22, 2011 In Africa, some ranchers shoot wildlife to keep them from eating the grass out from under their cattle. But it turns out some wildlife, like zebra, actually help cattle graze — by clearing fibrous grass stalks away and promoting the new shoot growth that cows crave.
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