Ginger is the brown bunny, Hiccup is the white one. Luna is my black kitten.
It took a little while to figure out what Ginger was doing and then I just had to catch what I could to share. The bins are their litter pans, but Ginger decided today that the larger one needed more hay, so she picked up bunches of it from the floor and piled it into the pan.
Once in a while she would dig into it and make a little burrow. She and Hiccup were rescued from a school where they had the run of the small yard area. They both love digging, which is why the wooden bits are on the floor of their pen - they were tearing up the foam pads that I put down to insulate them from our very cold floors.
Hiccup ignored Ginger in favour of staying out of the way, sitting inside the great cube until the remodeling frenzy was over.
Luna became pretty interested, though.