They are not lactose intolerant as such, but too much dairy can cause an allergic reaction. I've seen it in someone's gliders, they were advised by the breeder to give them a condensed milk and water mixture instead of a nectar mix, it killed the female. She showed the classic reactions, bloating, diarrohea etc.
Hmmm, I found an article about it, I will post a link later when I get a little time to dig it out again, and maybe I'll siticky it.
