Jess is only a kitten there but a year later she has kittens of her now so can be pretty nasty.
My old cat Tosh was siamese and absolutely huge, ruled the neighborhood for years and left every cat in the area scratched to pieces, one look at him and all the other cats would leg it but he didn't just look the part, he really was a vicious bastard even killed at least one other cat fighting and was still scratching anything in sight on the day he had to be put down at 16.
I have a picture but it's at my parents house.
http://www.zivotinjsko-carstvo.com/galerija/galerija%20macaka/siamese%20blue.jpgA bit like this one but bigger and nastier
I also had another cat Stripes who started off in the wild and would also fight to the death, even had one of his eyes scratched out fighting but it just made him fight more.