Maude. Via Smithsonian’s National Zoo.

Maude, a 41-year-old grey-cheeked mangabey who lived at the National Zoo since 1977, was euthanized yesterday. A gibbon injury required the amputation of one of her arms below the elbow within her first year in D.C., according to a release, but she still lived years beyond her life expectancy.

From a release:

Maude lived with many species at the National Zoo, including other mangabeys, colobus monkeys and macaques, and lived in many areas of the zoo, including the old Monkey House, the Great Ape House and most recently Think Tank.

Maude moved to Think Tank in 2011 to provide companionship for the Zoo’s elderly Sulawesi macaque, Spock. Due to their advanced ages, the two had outdoor and indoor spaces that catered to their specific needs. Though both animals had arthritis and other medical ailments associated with advanced age, the primate team made many modifications to their enclosures to ensure their comfort and ease in maneuvering around their exhibit. Maude enjoyed sitting out in the sun, eating grass and could often be found soaking up the rays in the outdoor enclosure with Spock.