Pretty sure the bunnies respawn so go out of area and back in and there should be more in high hall area.
Might be bunny or 2 along the right hand side of the harbor as well there is a small grassy area over there. Might be some around that castle on the cliff as well.
Also above the harbor on the left hand side there are some grassy areas might be some up there.
Think someone said you need 20 to get the killer bunny to spawn.
