My Embden geese roam the yard all day long and are kept in a small pen overnight for their protection. It was fine when it was just Elmer & Gertrude, but now that it's being shared by their 7 growing children it is beginning to STINK!!! We are in swampy South Florida where in the summer it is a gazillion degrees with 500 percent humidity. The pen is in a low end of the yard under an oak tree. Right now the floor is just the sticky dirt. All the poultry pens are in the back of the yard where the previous owners kept their horses, where they brought in some cheap fill dirt, which looks like a lot of chalky limestone stuff. After a very hard rain the yard floods, but it usually drains/evaporates by the next day. Late next week will be the first opportunity I'll have to complete a new pen I've planned to house some of these geese. I hope that will help with some of the problem, to give them more floor space for pooping. Until then, what should I put on the floor of the existing pen to help with the smell & the sanitation? I have some bags of play sand I could use, also some bags of decorative round river rock. Or I could rake up some pine straw. What would you advise?