Even if he digest a bit of aspen or even a mouth full he will be fine. We obviously don't want them eating chunks and chunks of it but he knows how to get bedding out of his mouth if it gets in. On top of that they digest bone... A little plant matter won't hurt him. Leaving him in his enclosure during feeding will make things much less stressful for both of you. And you won't run the risk of an accidental bite. Most bites happen moving the animal into the feeding bin or after.
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