DALLAS -- The Dallas Zoo has reopened its elephant exhibit two days after Keke the elephant died. Despite concern about an intestinal ailment, an exam shows the elephant died from heart failure.

It took 35 animal experts to perform the autopsy for the 8,000 pound animal. The result? KeKe's heart was not effectively pumping blood.

Jenny, the Zoo's surviving elephant, was back on display today. Officials say she's upset-- but responding well-- and ready to greet the public.

"We're getting her back into her daily routine just as quickly as we can," said Chuck Siegel, Deputy Zoo Director.

Though the elephant enclosure at the zoo meets national standards, animal rights groups say the animals are held in cramped conditions. Activists have criticized the zoo for KeKe's persistent intestinal problems, the last bout coming right before her death.

If she was basically eating rocks and dirt, and those things were making her sick, why didn't you take those things out of there? Why were they available in the first place?"

When asked if rocks and dirt made her sick, why didn’t they take those things out of Keke’s exhibit, Siegel responded:

"We actually did, every single day we would go into her exhibit, remove rocks if there were rocks that came up from the substrate-- but of course, the alternative is to place her on concrete. But you can't have elephants on concrete all the time because that's bad for their joints."

The autopsy shows Keke's joints were healthy. The question now is what happens to Jenny?

The zoo says, for companionship, she could be sent to another zoo. In that case, she might not return for two years, while the Dallas Zoo builds a much larger elephant exhibit.

E-mail dschechter@wfaa.com