He's behind you

I was sitting on the boardwalk waiting for the kingfisher. He'd headed upriver just before I arrived to eat my sandwich during my lunch break.

I sat there patiently waiting, for part of the time watching two buzzards through my binoculars.

One of the other visitors stopped and chatted for a while. Then he said, "Look behind you."

I did.

This little friend was keeping me company.