Today's bird is the Spotted Sandpiper. They're pretty common in marshes and wetlands around here. They're always bobbing their tails and poking around for food in the mud. I know this bird doesn't look like a Spotted anything, but this fellow (or lady, can't tell) is in the fall plumage, which is actually kind of dull looking. You can tell Spotted Sandpipers apart from semi-similar birds by checking out the yellow legs, white notch on the flank and the black and white eyebrow stripe.
They live all over the United States, so check out your local wetland. This one happened to be at Santa Anna National Wildlife Refuge on November 5, 2012.