Bark chippings - silly question?

We are all stocked up with 3 large bags of bark chippings and almost ready to put it down for our girlies. Sorry for what seems a silly question but will they eat any of the chippings and if so can it harm them? Our girlies seem to pounce on anything that looks edible. If they do eat small bits will it pass through naturally and not block them up 

Jan.

Hi Osborne27 and thank you  Sounds like the girls can be trusted not to eat it but do what chickens do best, dig, lol. I can just imagine how funny your girls would look with just their heads showing and hope ours get to have as much fun.

Jan.