Aiming? Who needs that? ;)
There seems to be a 3 "gator" limit, so just move around them until they get grouped up then dodge them until you get as high a score as you want.
Even better is if you shoot the group by accident, you'll kill them all in one shot, and they'll respawn in a group, so once you get them grouped up you never again have to worry about having trouble with aiming or dodging.