Associated Press
In this photo provided Jan. 25, 2011, by the Saint Louis Zoo, is a baby black rhinoceros calf with his mother, Kati Rain, at the Saint Louis Zoo in Saint Louis. The as yet unnamed male was born at the zoo on Jan. 14 and weighed 120.5 pounds.  He is the first black rhino calf to be born at the Saint Louis Zoo in 20 years. (AP Photo/Saint Louis Zoo)

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The South African government says a record 668 rhinos were killed in the country in 2012, an increase of nearly 50 percent over the previous year. Demand is growing in Vietnam and elsewhere in Asia where rhino horn is believed to have medical benefits despite evidence to the contrary. The horn is made of keratin, a protein also found in human fingernails.

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