Yeah, I forgot all about warthogs. Fast breeders, but they do need permanent water unlike springbok/gemsbok.
Bongo need dark, wet forests not scrub.
Hey Bakes what is an alpacca??
It is a pity that you don't have his stuff in stead of feral animals (although imagine if they weren't around either!!) The red deer/water buffalo were definitely NOT mistakes, but replace the hogs with warthogs/bushpigs and the feral goats with IMPALA or pronghorn antelope!!!!
I am positive nilgai would do well if given half a chance (frost kills them though)....the possibilities are endless.
Nevertheless, count your blessings and go hunt some ferals with no bag limits/seasons/licences/trophy fees...