The Zoo’s golden lion tamarin, Gisela, was humanely euthanized Monday

Photo of Gisela via Smithsonian’s National Zoo

From the National Zoo:

“We’re sorry to share that one of our golden lion tamarins, Gisela, was humanely euthanized Monday. She was hospitalized on Saturday for renal failure and liver dysfunction. She had been undergoing treatment for kidney disease for about 8 months. Gisela was born at the Zoo in March 2006 and participated in the golden lion tamarin free-ranging program with her family. At 8.5 years old, Gisela outlived the median life expectancy for golden lion tamarins in the wild, which is 8 years old. Four of Gisela’s younger siblings live at the Small Mammal House. Golden lion tamarins are endangered, but thanks to breeding efforts and a reintroduction program encompassing zoos (including the National Zoo), conservation organizations and the Brazilian government, there are now 3,000 living in the wild in Brazil.”

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