I've heard that it is bad for them, but also there is people on here who do feed it and haven't had problems. If you do a search on here you should come up with a lot of threads with discussions on it.
Citrus like most treats are find as long as you don't over do it.
That "treats chart" need to be really updated, there is a lot of incorrect and misleading information on it.
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I feed them whatever and they seem to know what to eat and what not too. Turnips they let sit for a few days before they eat them...no idea why. I have kumquat and oranges where they are and sometimes I see them eat them but not a whole lot...they usually don't bother them unless the grandkids bust them open or if the dog drops some. They love pommegranates a lot.
sharon
We were given lots and lots of oranges by a neighbor - they were delicious but we couldn't eat them all. I cut them in half and the girls loved them. I don't give them oranges every day though. I don't think I would feed them lemons or limes though.