article_snippet.sent: That's where his sister, Acara, comes in.
article_snippet.sent: After Tuah's birth, zookeepers began training Acara on maternal duties.
article_snippet.sent: Acara will turn 10 next month and is an eager-to-please orangutan that enjoys learning, Gordon said. '
article_snippet.sent: The first step was to teach Acara to be gentle with the infant. '
article_snippet.sent: They plied Acara with rewards.
article_snippet.sent: When Acara had mastered being gentle, zookeepers gave Acara a stuffed animal to teach Acara how to pick the baby up, hold the baby and flip the baby over.
article_snippet.sent: Acara has adjusted to child-rearing and will retrieve Tuah for animal keepers and carry Tuah between exhibits.
article_snippet.sent: Acara also helps Tuah navigate the ropes and stops Tuah from tripping on toys.
highlights_snippet.sent: Once Tuah's father is ready, Tuah's sister Acara will care for Tuah's sister Acara instead of humans .