Their lodge is overgrown with weeds and the slide (shown in these photos) has become overgrown.
We can hope it's just a bit of summer vacation, but according to the National Geographic special we watched with great interest, these large rodents stay in residence only for a dozen years or so. They eventually gobble up all the available food and are forced to move along. Probably just as soon as they finally got that living room set up just the way they like.