My My My. It looks like the Calgary Zoo has a less than stellar reputation. Check the controversy section in the Wikpedia entry on this zoo. 

https://en.wikipedia.org/wiki/Calgary_Zoo#Recent_controversy

One strange animal death. Well, anything is possible. A second one. Well, that could be an accident. But year after year, animal species after animal species, it seems this Zoo is a death camp for its animal inmates.