The world's oldest hippo, Bresta, 58, died in the Kyiv zoo in the early hours of 23 May, the zoo has said on Facebook.
"The world's oldest hippo, our Bresta, passed away quietly in her sleep. She had given us joy and love for the record 58 years. Her name will always be on the list of animals which made the world's leading zoos proud," it said.
The female rhinoceros named Trevoha, 46, died in the Kiev zoo in March.