Renee C. Byer/

Sacramento Zoo veterinarians Anne Burgdorf, right, Katie Delic, center, and student Rebecca Pacheco, left, ready Castro, a 15-year-old Sumatran tiger for surgery on Tuesday in Sacramento, Calif. Castro was suffering from urinary tract stones. About 30 different specialists from the Sacramento Zoo, UC Davis and Sutter Medical Group (a human urologist and Interventional Radiologist) participated in the procedure.

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