The female hippo was pregnant after mating with the same male, he added.
The female pachyderm, 'Sarita', was attacked by her male partner 'Devdas' around 4.30 pm on October 4 inside the zoo enclosure where they were housed, the official said.
"The female got seriously injured in the attack and succumbed to her injuries around four hours later," he said, adding that the zoo-keepers unsuccessfully tried to control the male, which had gone berserk.
A post-mortem was conducted and Sarita was later buried inside the zoo.
Bondla Zoo is located inside Bondla Wildlife Sanctuary in the north-eastern part of Goa.
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