The African Serval (Leptailurus serval) would normally react to a domestic cat by eating it, not mating with it.
But in America, cat breeders have successfully (if that's the word) forced mating of these two species and derived a new fashion pet - the so-called "Savannah" cat.
Normally, I'd roll my eyes and sigh "only in America...". But no. Some fashionable pet businesses in Australia have decided to import this serval-cat new breed so they can sell them to Australian's with a lazy $5000 sitting around.
Apparently our biosecurity system never anticipated people developing hybrid wild-domestic crosses. So this breed is allowed to come in as a "domestic" cat breed. No formal consultation necessary with experts like those on the inter-government Vertebrate Pests Committee.
We need a rethink here. I don't think these cats should be allowed into the country. They are apparently twice the size of normal domestics and can leap two metres in a bound. Those are genetic traits we don't want entering our feral population.
We are also allowing people to profit from animal cruelty. The practice of mating a 20kg wild African Serval with a domestic cat weighing maybe 5-7 kg should be condemned, not condoned. Big Cat Rescue have a You Tube video that is pretty instructive about how dumb this practice is