Bongo and axis deer at Knowsley Safari Park, 28 December 2009

What is up with some of the mixings at this zoo? In another photo I saw a wallaby with a blackbuck.

Knowsley are rather brilliant for these geographically incorect mixings. They make it very interesting imo. This particular reserve has Bongo, Emus, Wallabies and species of Asian Deer and Antelope whilst another Knowsley reserve has Rhino, Bison, Guanaco, Ostrich, Oryx and a few others.
I realize not everyone will be a fan of these but I find them appealing, it makes a nice difference from the usual hoofstock mixings.

Arn't the oryx in the centrel African reserve?

Yes, with the ankole cattle, wildebeest, red lechwe, sitatunga, and some deer (forgot species name!)