Hey Milo,
Now you have a ferret, your hawking will get so so much better mate! Especially your Rabbit numbers. I know the books suggest light coloured (albino) ferrets for hawking due to the colour of them being like nothing else they may hunt... But if the hawk is gotten used to the ferret & see's it enough & worked over it enough, i.e, ferret down the hole & out pops a rabbit, then it will quickly learn that the ferret is part of the hunting team & not to be hunted!
Happy hunting.
Will