They were the big bark nuggets. They get shoved around and I have to rake them around every few days if I want them back where they're supposed to be, had to do the same with straw. Th bark nuggets are a pain to walk on, I don't like that at all. I started using cypress mulch a week or 2 ago and while it still needs raked back (cuz the babies dig like little backhoes) I like it a lot better and it's tons easier to walk on. Straw is nice if you've got covered pens but it turns into mush if you don't, same with pine shavings. I'm liking the mulch a lot. And cypress won't mold and will just press down into the ground so you can add more on top. I know what you're going through-keeping them in pens became such high maintenance when it rained that's the reason I opted for the extra expense of just building yards for each little group. If you can find actual wood chips instead of the big bark nuggets go for it. That would be perfect.