Thanks for your advice,
We have a 2 yr old spiny-tail iguana who's favorite foods are her mango and raspberries. She is a great eater, though, and always licks the plate clean (getting a secong meal of greens only...which she also nearly cleans).
It's hard sometimes to give the spiny the "treats" and not be able to give them to the baby rhino, but we don't want to give her anything that might upset her stomach or keep her from her greens (she already picks the squash off first, and eventually eats the greens...also requiring a second meal of greens a day, which she eats).
Maybe I'll try giving her a tiny bit of fruit this Saturday and see how she handles it.
Thanks again, and no offense, but other opinions are appreciated as well!