Last night on the creek, the light was beautiful, and then the frogs began tuning up...

The light was so beautiful last night so I stayed to watch the sun go down. I was on the dock across the street when the nightly frog chorus tune up began. One will start to sing, the millions of others join in, but only for a few minutes. Then they stop abruptly and start the songs when it gets dark. I think it has something to do with the angle of the sun. I think I got it all on this video.