Not that aggressive, they are normally hand reared from 2 days old. I used to breed Servals in SA, removed from their mother before their eyes open and hand reared. Servals are thought to be the originators of the domestic cat -Serval DNA found in just about every domestic tabby and the cheetah -the rest of the enigmatic cheetahs' DNA comes from an unknown and extinct source-, the ancient Egyptians kept them to control rats in their granaries. You have to experience a 17kg vibrating hot water bottle on a cold winters' night. Have to watch your fingers at tucker time though. And any small animal entering their enclosure is dinner, I've seen them pluck a Guinea fowl out of the air 2 metres above ground. Normal diet is rats, snakes small birds, reptiles etc hunt singularly and definitely won't take anything bigger than themselves, but that said new born lambs and fawns would probably be on the menu. Servals rated as DWA and Red Booked, but F1 serval/puddycat -Savannahs or Bengals in the US -crosses and beyond are OK. Servals and their distant asian Bengal cousins are the only wild cats known to be able to cross with your tabby, not sure about Wild cats though, Lions and Rooikat known to kill and eat Servals. There are 7 -at least- acknowledged sub-species based on size and colour, probably habitat derived, ie desert animals from North Africa smaller and paler in colour. F1's sell from 1500 quid upwards.