A Chausie (aka Jungle Curl, Stone Cougar, Mountain Cougar) is a hybrid of the domestic cat (Felis silvestris catus) and the Jungle Cat (Felis chaus). Generations are identified by F1, F2 etc., with F1 being the offspring of the original cat and jungle cat mating. Males in the F1 to F3 generations are usually sterile; however, some F4 males may be fertile. The domestic cat breed most widely used for Chausies is the Abyssinian, because they have the same look and active habits as a Jungle Cat, but are very much smaller. A Chausie, due to the various sizes of the parents, can weigh between 9 and 30 pounds (when full grown, the males are larger than the females). They were first bred in the late '60s or '70s to provide a safer alternative to keeping full jungle cats as pets. The breed was gran