I have two boys who will be two years old this spring. I got them October 2009. Recently, one of my boys, Hemi, began burrowing. I have a FN142 and on the second floor I have fleece that is double layered that just lays on the tray. Hemi has started burrowing under the fleece. At first it was really cute to see him poke his little head out to see what's going on. Now, he rarely comes for scratches and doesn't snuggle as much with Hank. Hemi has always been much more active and Hank always pretty melo. They used to be next to eachother all the time, but Hank seems pretty annoyed with his recent antics. Hemi has also started biting me. He did this when I first got them - which I expected as they didn't know me. But he rarely bit for about a year. Any ideas as to what is going on?