Celebrating the Longevity of Hannah Shirley: The Oldest Known Pygmy Hippo in Captivity

Ever wondered how a pygmy hippo celebrates its birthday? Surprisingly, it involves a watermelon feast and festive decorations-no elaborate plans needed.

Hannah Shirley: A Record-Breaking Pygmy Hippo

Hannah Shirley holds the distinction of being the oldest pygmy hippopotamus ever documented in human care. Rescued in 2002 from a private backyard in Escondido, California, she now resides at the San Diego Humane Society’s Ramona Wildlife Center. While wild pygmy hippos typically live between 30 and 50 years, Hannah surpassed this range on May 25, 2025, reaching an age of over 51 years and 6 months.

According to records maintained by the Association of Zoos and Aquariums (AZA), Hannah was born on November 22, 1973. She is registered as animal #365 in the AZA’s Regional Studbook, which monitors pygmy hippos in managed care worldwide.

Global Spotlight on Pygmy Hippos

In 2024, pygmy hippos captured international attention with the birth of Moo Deng, a lively calf in Thailand, and the arrival of Haggis, a charming pachyderm in Scotland. These events highlight the species’ ongoing conservation interest and the efforts to protect their dwindling populations.

Native to the swamps and dense forests of West Africa, particularly Liberia, pygmy hippos face severe threats from habitat destruction caused by logging, agriculture, and urban expansion. Currently, fewer than 2,500 individuals are estimated to remain in the wild. In North America, only about a dozen pygmy hippos are housed in accredited zoos and sanctuaries, including institutions like the Pittsburgh Zoo & Aquarium and Chicago’s Lincoln Park Zoo.

Hannah’s Impact and Conservation Significance

Autumn Welch, the Plants and Fauna Operations Supervisor at the Ramona Wildlife Center, expressed her admiration: “Every day with Hannah Shirley is a blessing. Her playful nature, resilience, and gentle demeanor make her a true ambassador for her species-demonstrating how dedicated care can enable animals to thrive well beyond their natural lifespan.”

Hannah’s Journey and Legacy

Hannah’s story is not just one of longevity but also of resilience. Her age surpasses the average lifespan of wild pygmy hippos, which is a testament to the quality of care provided in captivity. Her presence continues to inspire conservation efforts and raise awareness about the species’ fragile status.