They like the shred,chew,make noise. It's just them I've kept pigs on newspaper for years and no problems. Just make sure there's no staples and we make sure any photographs of Boris Johnson anre uppermost for them to pee on , the freebie Metro usually has at least one pic a day.
Though now I'll struggle to find BoJo pictures. <<sigh>>
Oh phew! We've had them for 3.5 years and I don't remember them eating newspaper so compulsively. I've seen them do it once or twice when they were running low on hay but always stopped when I topped them up. Fresh hay hasn't deterred them this time!
I think it's The Sun and The Sunday Times. I always Nick the newspapers out of my aunts recycling bin as we don't buy newspapers!
Occasionally, if DH has been away for work (free papers on airlines and in lounges) mine get a Financial Times to chew on. As a great treat he sometimes brings back a German or French newspaper. I like to think they're digesting a great deal of knowledge making them more rounded pigs (in so many ways)
According to Mollie and Sadie "because we can and we like to worry you" No Nationals or Broadsheets for the EastMids piggies, local daily rag - they often pee (to my delight) on pictures of our local MP, who is always in there as she'd attend the opening of a paperbag to get in the press/on tv. They also get to read chew a local fortnightly paper, this has the added bonus of more pictures of said MP and also pictures of our local fireman Sam near neighbour to pee on ... petty pay back for when he parks over our driveway !