Dr. Mrinalini Watsa, a researcher at San Diego Zoo in California, scoops up soil from a fresh paw print made by Rakan, a 4-year-old male Sum...
Dr. Mrinalini Watsa, a researcher at San Diego Zoo in California, scoops up soil from a fresh paw print made by Rakan, a 4-year-old male Sumatran tiger who lives at the zoo, and secures it in a specimen jar.
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