Rosebud, nicknamed "Rosie" by zoo staff, was humanely euthanized on Friday after battling progressive arthritis that no longer responded to medication.

The chimpanzee was often found in the center of any grooming session and enjoyed relaxing in the sunshine in a nest she built herself, Zoo personnel said.

The Saint Louis Zoo is taking extra steps to protect its visitors and animals, with a new security system being implemented to ensure your visit is safe and fun.

The Saint Louis Zoo has put in place new security measures this fall in an effort to make guests feel safer. Guests with large bags, strollers, wagons, coolers, wheelchairs, backpacks and purses may also be subject to a bag search after passing through the automatic detection system,