description Loon Overview
Loon was a male drill kept at the San Diego Zoo. Born at the Philadelphia Zoo in 1979 and transferred to San Diego in 1982, he developed diabetes and was trained through operant conditioning to present his arm for regular blood sampling and insulin injections. Preserved tissue from Loon was later involved in research producing induced pluripotent stem cells from an endangered primate, linking his medical care with conservation science.
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