Notice the Seagulls on Each of the Lamps - James River Bridge - Newport News, VA
As you can see from the cloest one, the "bump" on the top of these lights are seagulls. None of them had more than one seagull and there were some empty ones. It was funny to think of them defending their own lamp. Wonder if they sleep up there when it's cold since the light would provide a bit of warmth for the night.