Some sad news out of the National Zoo today: Officials announced that they had to euthanize a tammar wallaby yesterday, the last one living at the reportedly troubled Cheetah Conservation Station.

The wallaby, a geriatric female named Maji, was 18-years-old, which is “extremely old for wallaby,” the Zoo said in a Facebook post. According to the National Zoo, about 90 percent of tammar wallabies don’t live to be older than ten. “Advancing age, decreasing appetite, and weight loss” made Maji’s quality of life rapidly decline, so the Zoo was forced to euthanize her.

The Post adds that Maji was upset by “the recent arrival of the large, loud, and long-beaked hornbills.” So much so that she was injured herself after running into a wall.

Here’s the full statement from the National Zoo:

“We’re sad to announce that yesterday we had to euthanize a tammar wallaby. The wallaby, Maji, was a geriatric female. She was the last wallaby living at Cheetah Conservation Station. Maji was 18 years old, which is extremely old for a wallaby—90 percent of tammar wallabies do not live to be older than ten years old.

Maji arrived at the National Zoo in 2006. She had a history of dental issues, which is not uncommon according to data collected on marsupials living in zoos. The animal care team, veterinary team, and nutritionists were successful at keeping Maji comfortable and healthy as she progressed in age. She had been treated for her teeth issues—including having teeth pulled and cleaned as necessary. She’d also been on medicines to treat infections and to manage her pain. Nutrition worked with animal programs and the vets to design special diets to ensure proper nutrition, even with her issues.

Unfortunately, her advancing age, decreasing appetite, and weight loss meant that her quality of life had declined. We have been monitoring her condition for several years. She recently began eating less even of her favorite foods. In such situations, we monitor and assess quality of life and euthanize an animal when it becomes necessary to prevent suffering.”