Trust piggies to 'repurpose' what you give them! Mine do the same - they have a big teepee type cosy which starts off attached to the roof and them is stamped on until its a big puddly mess on the ground, with one pig inside, one on top, and one under! Never with such adorable chooken feet though!
(Meg was on top, but came over in case the camera might suddenly turn into something edible)