ya know i just have to ramble on even if i don't know the answer, why i have no clue.. haha.
i have heard controversy about newspapers, some people have said the ink is safe because of what it's made out of, and other people have said its not, but i have heard more people say it is safe than not.
but from what you said, i'm thinking if hes just taking a nibble, its probably not where the ink is because you are holding it reading and the edges are just plain paper, and a few bites here and there should be fine.
i keep paper towels on top of the cages, because i use them alot in there, try to keep the roll on the back of the cage because there is cloth up there and they can't reach it, but ever once in awhile, when i put the paper towels back on top of the cage, i put it on the part of that cage top that isn't covered with cloth and of course they reach thew and eat/chew it...
jean