I guess 2 things here:
1. Whitey is a small guy, just looks fat in that pic. He's kinda low in the squirrell ranks here, hangs by himself mostly. Don't kow if he's a real albino, or just a different color, cuz he's not all white. We Have black (and I mean jet-black) squirrells near where I work.
2. The plants; the main low plant you see to the left middle is Hygrophillium something species. I SUCK at latin names, sorry (edit, the irony of having a Latin handle is not lost on me). It grows so fast its unbeliveable, like a weed. I got a redder variety earlier this week, going to repalce it. I love plants, it cost me $1.50. Soon I'll have a ton of it. This summer is going to be fun, tryin all kindsa plants in my pond, I have so many cuttings now it's ridiculous. The floating plants are common duckweed, also mutiplies ridicuosly fast. they take a lot of either phosphorus or potassium out of the water, i cant recall which right now, sorry. That helps keep the algae problems down a lot. I hardly have any algae now. I need to take a lot of duckweed and hygro out Sunday. I wont mess it up too bad, give you a pic then.
Edit: one other very good reason to prune is that the Hygro is choking off a bunch of plants that I'd like to see grow!