'Mommy,' a Galapagos Tortoise, has been there for 90 years, making her its longest resident.
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Mommy arrived at the Philadelphia Zoo back in 1932.
She celebrated her 90th anniversary by enjoying some of her favorite treats.
She even got a visit from her friend Ziggy the Alpaca.
Mommy is estimated to be 97 years old, but she's not the zoo's oldest resident.
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That title belongs to a 99-year-old tortoise named 'Abrazzo.'
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