It is widely considered the "UV Spectrum" bunny . The Strategy: Equip your UV Light before entering rooms.
Down in the Sewer area near the train track entrance; it is sitting on your left as soon as you walk down the stairs. Bunny No 06
This specific bunny is infamous among players because it does not have a set, static spawn point on the grid like most others. It is widely considered the "UV Spectrum" bunny