The accident occurred when the animals were to be taken in for the evening.
An ostrich came running at high speed, followed by an eland antelope.
In the situation that arose, the zookeeper was barred.
The man who died was 58-year-old zookeeper Fanica Gherasim, a Romanian guest worker who had worked at the park on and off for the past four years.
Prosecutors have started a preliminary investigation into suspected work environment violations.