Muskrat in Minnehaha Creek

I went on an expedition last Wednesday to Minnehaha Creek, after hearing about a sighting there the week before. One block east of the 34th Avenue bridge here's what I saw, a beaver, paddling along, carrying a branch with lots of fresh green leaves. Hope to get a closer shot next time.

Correction (Jun 29, 2008): After seeing it closer yesterday, I now think it's a muskrat, not a beaver.