I just went to give the pigs some veggies, and found Twoflower rolling around in the hay on her back (a bit like dogs do when they find something particularly smelly!). At first I thought she was having some sort of fit, but as soon as I put the veg in (seemed like the quickest way to free up my hands), she was up and scoffing as normal. Is this normal behaviour for a guinea pig? I have to go in to work today so I can't keep an eye on her - possibly just being a little paranoid... :{