The Gombe Forest is a $2.1 million exhibit that is home to the zoo's chimpanzees. The Gombe Forest is an indoor/outdoor exhibit built in 2001 to house Hank, the zoo's long-time resident and seen in photo at right, as well as several other chimps. Hank, found in the rain forests of Africa in 1968, was donated to the zoo in 1976 and became the longest and most famous resident of the zoo before passing away of natural causes at age 42 on January 24, 2011. The Donovan Interpretive Center features an indoor chimpanzee viewing area and other small exhibits.