This just in: Jaguar mauls zoo keeper at Denver Zoo. The keeper died and reports say that the male jaguar was shot. Here is another report from CBS in Chicago.

It sounds like the keeper entered into the exhibit area or the jaguar penetrated access into the adjacent keeper area.

Zoo animals may be habituated to humans but they remain true to their wild nature. Human error accounts for most of the attacks I am aware of. Here is a local news video done from the Denver Zoo.

http://www.denverzoo.org