I went back to the same marsh I'd visited in early December, after a few more rainstorms. The ponds had spread, covering trails I'd walked along just a few weeks earlier. Ducks and geese had arrived in force.
I could also swear I heard a frog, but I couldn't see it, and even with the weird southern California seasons, I don't think it's the right time for frogs to be out. I should've asked at the visitor center.