Looking out the window at the office the other day I caught a glimpse of duck (Merganser?). The river is about fifty feet away and our office is on the second floor. Slid open a window, set up the camera with the longest lens I have, and tracked the ducks through the lens hoping for a clear shot through the branches.

Finally got a so-so opening, took one photo... *click* ...and they burst into flight! This photo was taken a split second later.