She was under medical care and was being treated for "chronic cardiac 
issues," the statement said.

But look at the all leavened bread she is eating!

http://www.nytimes.com/2013/04/01/nyregion/pattycake-elderly-resident-of-bronx-zoo-dies.html

I don't know about the zoos here, but in the Washington, DC zoo they 
have signs about how they feed the animals the diet they would eat in the wild.