The staff found the animal dead in the Wild of Africa habitat, and according to the zoo, the death does not appear to be from natural causes.
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The Dallas Police Department has been asked to take a look into the matter.
Additional cameras had been implemented throughout the zoo in the past week, and increased security was added overnight.
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"The animal care team is heartbroken over this tremendous loss...We will continue to implement and expand our safety and security measures to whatever level necessary to keep our animals and staff safe," the zoo tweeted in part.
Earlier this month, the zoo dealt with another incident which involved a clouded leopard that went missing from its exhibit. It was thankfully found safe on-grounds hours after its disappearance, but an investigation found that the fencing around the leopard's habitat was cut, allowing it to escape.
SEE RELATED STORY: Dallas police find 2nd breach at zoo after leopard briefly escaped on Friday