“It was a completely sudden death due to cardiac arrest. The chimpanzee had a heart attack which proved fatal,” he added.

Additional Director of Karachi Zoo Abida Raees said that the animal was healthy and did not have any injury.

She also confirmed the cardiac arrest as the cause of the death.

Meanwhile, several citizens blamed the management of the zoo for the death of one of its animals. They alleged that the chimpanzee died because of the negligence of the management.

They claimed that the animals were falling ill due to deteriorating cleanliness conditions at the zoo.

This is the latest in a series of events where animals have been reported dead at the Karachi Zoo.

Noor Jehan, an ailing elephant in the Karachi Zoo died on April 22 after efforts for her revival by experts and a Reikhi healer failed.

Noor Jehan was suffering from a joint and bone condition she developed earlier this year. The disease progressed leaving her hind limbs partially paralyzed.

She could barely move from the pain and was dragging herself around before she collapsed in her pen and could never recover again.

Madhubala, another elephant at the zoo was diagnosed with a blood parasite in June.

The medical reports indicated that the sample from Madhubala tested positive for Trypanosomes, although in very low numbers.