i would suggest getting them tattooed. . . irealize that many people think it is cruel, but i personally feel thereare many benifits to getting your rabbit a permant ID card in theirear. . .
just try to find a local breeder, or get in contact with the 4-h officeof your area and ask them if they know of anyone that can tattoo. . .
it might be a slightly painfull process for the rabbits (it doesn'thurt them for to long), but in the long run you will know them apart,and that way you always have an identification incase one got losts orwhatever
or you can use the marker in the ear. . .i use to do this with my dwarfhotot babies to tell them apart, as they all look the same as babies. ..
if you do choose to get them tattooed, just make sure you aren't in theroom while it is happening. . . i almost had a pet owner faint when itattooed her bunny while she was in the room. . .