When a François’ langur monkey named Chi was born on February 28, 2017, animal care staff realized that his mom, 4-year-old Mei Li, had rejected him and failed to nurse him. Though this species practices alloparenting, where all members of the group participate in rearing their young, the other langur group members had also decided to not take care of the baby. That did not deter animal care staff, and they worked to reintroduce Chi to his family. They gave Chi supplemental feedings, and every day they did introductions to see if Mei Li would accept her baby. After about 10 days, she did—and the animal care team and Mei Li were able to raise active little Chi together.