Feb. 10, 1983

<b>Feb. 10, 1983:</b> Brookfield Zoo polar bear Trisha opens wide with the help of a dose of anesthesia and a jaw sling as zoo veterinarian Scott McDonald performs a root canal on the 17-year-old, 600-pound animal.
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( Carl Hugare / Chicago Tribune )

Feb. 10, 1983: Brookfield Zoo polar bear Trisha opens wide with the help of a dose of anesthesia and a jaw sling as zoo veterinarian Scott McDonald performs a root canal on the 17-year-old, 600-pound animal.

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