Dolly, the oldest rhinoceros in the United States, passed away at 56 at Zoo Knoxville in Tennessee. She was euthanized on February 15, 2024, after a rapid decline in mobility. Despite receiving specialized care for aging animals, her condition worsened, and veterinarians determined further treatment would not improve her quality of life. Experts from the University of Tennessee College of Veterinary Medicine assisted in the decision. Dolly was a southern white rhinoceros, born in 1968 in South Africa’s Hluhluwe-Imfolozi Park. She arrived at Zoo Knoxville in 1976 and played a key role in conservation, successfully raising 10 calves. She also helped educate the public about rhino conservation. While southern white rhinos are the most common of the five rhino species, their numbers are declining due to poaching and habitat loss. The average lifespan is 36.5 years, making Dolly’s long life remarkable. The global rhino population has dropped from 500,000 in the early 1900s to 27,000 today, with over 10,000 killed for their horns in the last decade. Zoo Knoxville honors Dolly’s legacy and continues its conservation efforts.