A young female, Tiur (“optimistic”), follows ... in part because of the same challenge that faces orangutan researchers on so many fronts: Their subjects are just so difficult to study.

The baby was born at 2:30 p.m. on Feb. 20 to Basan and Sirih, also the parents of Mila an 8-year-old female orangutan also born at the zoo. In 2003, Sirih gave birth to another female named Jahe ...