Over the years, I've heard everything from "anything citrus (oranges, lemons, grapefruit, etc.) is POISON to squirrels" (presumably because they are fermenters) to "it's great for them--has a lot of calcium." I give mine a little chunk of orange or tangerine every once in a while, and some seem to like it quite a bit. I suppose I should do my own google search here, but I'm feeling lazy. Anyone have any REALLY GOOD info on the subject?