Well, I certainly hope they bring a good supply of Immodium with them, they are going to need it. They will be experiencing some dis-stress if they change their diet so radically for more than a couple days.

Hope they find a good leaf source while they're at it. Bark is kinda rough.

I prefered alder leaves myself. Just the right size, and nice and smooth, but with just enough gentle ridges to get the job done.