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"Keepers have a special dietary and exercise program for her to ensure she maintains her health and mobility leading up to the birth," the zoo wrote.
According to a blog post, Thong Dee's exercises include stacking tires, stepping on to a raised area, stretching, raising legs into the air and lying down as seen in the video.
Keepers have also provided Thong Dee with a diet including higher protein hay, supplements and ample amounts of fruit, vegetables and tree branches to keep her healthy during the 22 month pregnancy period.