Roughage For the Hawk

I am so embarrassed I didn't know about owls spitting out mouse bones and such in pellet form. It's pretty basic owl stuff, I guess! I just glanced at a wikipedia article about it so now I'm an expert. "It is therefore advisable to sterilize pellets in a microwave oven before study," is one sentence from the wikipedia article. There is also something about feeding roughage to a hawk.