Since I've had the NV unit I've noticed a few times along with both wor kid and DavyT63 that when scanning a field with the NV + addon IR even in more or less total darkness that rabbits still give it legs.
Even when the normal code of practice for fieldcraft have been followed e.g slow movement, downwind, no cast of shadows etc they react as though they can see the IR.
Ive done a bit of searching and can only find this....
Like most crepuscular/nocturnal mammals, rabbits are not very sensitive to red or long-red wavelengths, and they should not be bothered at all by an infrared light