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WASHINGTON (WUSA9) -- An elderly geriatric grey-cheeked mangabey was humanely euthanized on Monday.

Maude was 41 years old. The typical lifespan is early 30's for her species. She was born at the Mesker Park Zoo in Evansville, Ind. on Feb. 25, 1973, and came to the National Zoo in 1977, zoo officials said.

During Maude's first year at the Zoo, her right arm had to be amputated below the elbow due to a severe injury. She moved to 'Think Tank' in 2011 to provide companionship for the Zoo's elderly Sulawesi macaque, Spock. Both animals had arthritis and other medical problems due to the old age. Maude enjoyed sitting out in the sun, eating grass and could often be found soaking up the rays in the outdoor enclosure with Spock, zoo officials recalled.

Maude was the last remaining grey-cheeked mangabey in the Association of Zoos and Aquariums' population.

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