The Milwaukee County Zoo has announced that longtime resident Patti, a river hippopotamus, was humanely euthanized on Sunday, ...

Patti, the oldest hippopotamus in U.S. zoos accredited by the Association of Zoos and Aquariums, died Nov. 10, at the ...

Patti, the oldest living hippopotamus at an accredited zoo in the United States, has died. Patti had marked her 55th birthday in February. On Nov. 9, veterinarians noticed she appeared lethargic after ...

Patti was born in 1972 at the Dallas Zoo. She’s been living at the Milwaukee County Zoo for more than 50 years. The median life expectancy of a hippo in human care is around 37 years ...