Mallard
Anas platyrhynchos
Notes:

It's fairly common to see mallard pairs walking through the neighborhood in spring. But they seem to disappear in early summer. I'm not sure if any of them actually nest in the neighborhood.

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I think the environment should be put in the category of our national security. Defense of our resources is just as important as defense abroad. Otherwise what is there to defend?
Robert Redford
Yosemite National Park dedication, 1985