How do you tell your degus apart?
We just got our degus on Saturday, and they look almost exactly alike. The male is a tiny bit bigger, but not much, so we really have no way to tell them apart other than to flip them over and "peek" every time we pick one up (which they don't like much). How do you tell yours apart?
When I was much younger, I used a tiny dot of nailpolish on a hamster's foot if I had two that looked the same (I had tons of hamsters as a pre-teen/teen), but I wasn't sure if that was healthy for degus. I also thought about taking a washable non-toxic marker and making a tiny dot on each one's ear, in a different color, but I'm not sure if that's healthy for them either. The last idea that I thought of was to put ferret collars on them in different colors, but I'm worried that they will interfear with their coat care and shedding, and the only ones I can find have bells (which I'm afraid they'll chew off and eat).