There's the osprey. I don't even know if this is one of the adults or one of the babies. I'm guessing a baby because it was not quiet, calling quite often, especially when another raptor flew over.
The science center was closed. Oops. I should have done the research. I had sort of assumed we'd be able to park in the center and look at things. That would only be true if we were a class coming on an appointment. Next time I will know.
I ought to be able to identify these, and I cannot. They do look lovely in their spring garb, though. Edit: Thanks Haucusuchus for putting me out of my suspense. The birds are American Avocets. I first started being interested in some of the water birds in the fall. It's amazing how different they look now that spring is here..