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🇦🇺 Australia /Culture & Society

Zoo's attempted reunion between baby chimp and mum ends in aggression

From ABC Australia · () English

Summarized and contextualized by DistantNews.

At a glance

News Named sources Ongoing story
  • A baby chimpanzee named Cassie, born in June at Rockhampton Zoo, suffered a broken leg after its mother, Sile, dropped her.
  • Attempts to reunite Cassie with her mother and another female chimp, Mary, resulted in aggression and minor injuries to Cassie.
  • Keepers are continuing to hand-rear Cassie, providing 24/7 care and trying to mimic natural chimpanzee interactions while consulting primate experts on next steps.

Keepers at Rockhampton Zoo are continuing the intensive hand-rearing of a baby chimpanzee named Cassie after failed reunion attempts with her mother and another female chimp led to aggression. Cassie was born in June to mother Sile, but was dropped shortly after birth, resulting in a broken leg that necessitated intervention.

We were seeing all the positive signs leading up to attempting the first introduction.

— Blair ChapmanRockhampton Zoo curator Blair Chapman described the initial positive observations before the reunion attempts.

Following Cassie's recovery from her leg injury, zoo staff facilitated interactions with the chimp troop through screens, observing positive signs before attempting introductions. However, the first introduction with Sile resulted in the mother showing aggression towards Cassie, forcing keepers to separate them. A subsequent attempt to introduce Cassie to another adult female, Mary, who had recently experienced stillborn twins, also ended in aggression, causing minor bruising and bite wounds to Cassie's belly and bottom.

Unfortunately, Sile did show aggression towards Cassie, so we did end up having to cease the introduction and pull Cassie back out.

— Blair ChapmanChapman explained the outcome of the first attempted reunion with the mother chimpanzee.

Cassie is currently receiving round-the-clock care from keepers, who are striving to replicate natural chimpanzee behaviors. This includes feeding her a bottle every three hours and wearing specialized "chimp vests" designed to encourage clinging, mimicking how infants attach to their mothers' fur. Keepers are also ensuring Cassie vocalizes with and is exposed to the troop's sounds and behaviors, including those of her father, Alon.

Because of the positive behaviour that we were seeing with Mary showing a lot of interest, Mary asking for the baby, we proceeded with that introduction.

— Blair ChapmanChapman detailed the reasoning behind proceeding with the introduction to another female chimp, Mary.

Zoo curator Blair Chapman stated that while hand-raising is a last resort, it was necessary due to Cassie's significant femur fracture. The zoo is consulting with primate experts globally to determine the best course of action for Cassie's future integration. "Chimps are very unpredictable, so you never know how things are going to go," Chapman noted, acknowledging the inherent challenges and the unfortunate outcome of the recent introductions.

She did have some bruising on her belly … and a couple of bite wounds on her bottom.

— Blair ChapmanChapman described the minor injuries Cassie sustained during the introduction with Mary.
DistantNews Editorial

Originally published by ABC Australia. Summarized and contextualized by our editorial team with added local perspective. Read our editorial standards.

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