This little House Sparrow landed on the train car right behind the engineer,
just before we left the station for the zoo ride.
I thought it was a good time for a limited DOF to have only the bird in focus.
Although I used f/6.3 - I was zoomed out and a bit of distance from both the bird and the engineer, so it did give a shallow depth of field that I wanted.
It would have been a better shot without the oof greens on the left, but that was out of my control.