Cynthia, the world's oldest known red ruffed lemur, died Thursday at the Museum of Life and Science, her home for more than a decade.
Cynthia had to be euthanized Thursday morning after suddenly declining health, the museum reports. She had turned 35 in March.
The museum's lemur exhibit is home to seven ring-tailed lemurs and two red ruffed lemurs. The habitat includes a climbing structure, tall trees, ropes and a camera that visitors can operate to get a closer view of these playful creatures.
Red ruffed lemurs are named after the thick ruff that spans their necks, according to the museum. They use a series of at least 12 different sounds to warn of predators. They also have very acute senses of smell, vision and hearing, the museum's website says.