They do...which drives me a little crazy. I have been really getting their watering place, coops, etc. neatened up and all and had placed a small pad of hay next to the base of the waterer~to keep down the dust/mud and also as a place for Jake to lay....that's his fave spot but he likes to lay on the soft hay. They never scratch there ordinarily but just as soon as I put down this little dab of hay they promptly walked over and scratched it to one side to look for bugs.
Same with any landscaping mulch we put down here...we have to stretch and pin down deer netting over it all to keep the chickens from scratching in it like it's some new treat....they would never scratch there ordinarily but watched us spread the mulch, then raced to be the first to scratch it up....jokes on them, the deer netting is a great deterrent.