Depending on their size and location, zoos receive between a few tens of thousands to several million visitors annually.
In order to finance the project, the zoo received subsidies, but needed to sell the campground to cover its portion of the cost.
As the zoo received no state funds, several activities were arranged to bring in revenue.
The visitor record was set in the first year of the "Oceanium" when the zoo received 439,533 visitors.
The zoo receives birds of prey that have been injured and heals them.
Over the years the zoo received much criticism for the living conditions of its animals.
Nowadays, the zoo has received the support of foreign countries.
The zoo received 363,426 visitors in 2011, up 5% from the previous year.
The zoo is open 364 days a year and receives more than 700,000 visitors annually.
Six zoos have recently received this species and breeding was expected to begin by 2011.