This large rabbit (the Bunny Behemoth) was up in the final room of the Alice area (the very large mostly-circular room), in the north-east of the zone. The in-game /loc is approximately: +1690, -480, -7.
The map file paste I recorded for this location is:
P 480.7868, -1686.4103, -8.4587, 0, 0, 0, 3, the_Bunny_Behemoth
(Put this in your mischiefplane_1.txt map file for example.)
Rondor