For the May first holiday, a 3 month-old Francois’ Leaf Monkey was placed in the Wuhan zoo's monkey exhibit for the first time. The next day his caretaker, model worker Zhang Bangsheng, discovered that the little monkey had indigestion and difficulty defecating, and immediately became worried. Seeing peanut shells on the ground Old Zhang immediately understood that the toothless monkey had swallowed a peanut whole. If it did not quickly defecate it, it would endanger the little monkey’s life. Because the monkey was so small it was unsuitable to use a laxative.

He cleaned monkey’s buttocks, then began using his mouth to lick it, not stopping for over an hour, until the little monkey defecated a single peanut. Only after the peanut was defecated did 50-year-old Zhang Bangsheng laugh with satisfaction.