I thought it was really interesting and it has reinforced my thoughts about why the TEAS piggies haven't experienced the bladder issues that seem to be so prevalent in many guinea pigs. I feed a very wet diet and our piggies get outdoor time, all year round, obviously weather permitting. When I say outdoor time, I mean they get around 15 to 20 mins in a run, on the lawn, while I clean their cage. They love this time and munch the grass nonstop! Our guinea pigs are kept in a Dunster House log cabin, which is heated overnight and also during the day, when the temperature is low. However, for a few hours every day, I open one door, just leaving the mesh doors closed, to let fresh air into the cabin. I add more hay to the cages, so if they feel chilly, they can get under the hay, which is very insulating, but they are protected from damp, draughts, etc. I use water bowls for the dental piggies, who struggle to cope with the water bottle, but I am going to add bowls to all cages, in addition to the bottle. Although I use bath mats on the bottom of the cage, I pile the cages high with hay, as they love to play in it. It's interesting to see how even the older piggies start to popcorn, when lots of fresh hay is added!