As the tittle says, I have a few Cornish chicks that do whatever they can to scratch away the paper towel and dig and eat the pine shavings underneath.... Not sure how to persuade them to stop.
unless I just cut it out or replace with hay maybe?

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Just take out the shavings underneath or make sure they are the large flake and not mini flake. Some are more determined than others to eat it and it can kill your chick. You could try sand underneath. I’m using the same setup but luckily mine aren’t eating it when they dig along the sides. I do like paper towels though as it’s easier to keep the smell down in the house.
Thank you all for your responses! The Cornish are about a week old, and the flakes aren't tiny but there are some smaller pieces that they are able to peck and eat... I don't have grit on hand but ill consider grabbing some for the future.
I only have 4 of the chicks, and I have them in a larger plastic bin. They definitely have lots of space until maybe they're closer to 3/4 weeks.
Anyone have experience with hay? I think the only concern I would have is the dust.
Or to gorge on something new.But think it shows their propensity to eat grit.