The Sacramento Zoo has announced that Ewell, a 54-year-old white-handed gibbon monkey, was euthanized on March 19 following the death of his daughter, Siidam. The zoo cited several age-related health conditions including arthritis and declining vision as the reason for the euthanization. Ewell's age made him the oldest male gibbon in an institution accredited by the Association of Zoos and Aquariums (AZA). The zoo praised its staff and animal caretakers for their dedication and professionalism.