A bunch of us were walking on a levee trail along San Francisco Bay, and I spotted something swimming against the tide. I moved in closer to the shore, and I could tell that it was some furry animal, but I was not used to seeing any furry animals swimming in the bay. Sea otters don’t seem to get this far into the south end of the bay. River otters don’t seem to be found around this area at all. Muskrats were too small compared to what we saw. I sent a photo and posed an inquiry to the experts at Don Edwards National Wildlife Refuge, since it was almost in their back yard. The answer came back: beaver. Apparently one had been spotted recently a few miles south of our trail. Amazing. Some photos are at the online photo gallery.