They seemed quite wary, and I couldn't get very close at all before they heard or saw me and took off flying.
As I was editing the photos just now, I got curious about what kinds of ducks they were. The best I can figure out from the very white breasts on some of them is that those were Northern Shovelers.
After closely examining the photo above (click it to enlarge it) and judging by the wings, I'd say some of them are Blue-winged Teal.
Then Monday morning as I was waiting for Courtney to arrive, I looked out the window to see if they were coming up the road yet, and I was surprised to notice this duck sitting on a tree branch across the driveway:
It's a male Wood Duck.
Although he's pretty all over, I especially love his distinctive red eye!
Update: I saw him again this morning. And look closely behind him and down a little bit:
His mate was there, too! I wonder if she was considering building a nest right there.
She soon flew off to another branch, and I was able to get a quick pic of her before they both took off.