This is BirdNode.

During the day, an American Robin sings a lovely familiar song of rich phrases.

The phrases vary and ring forth with a little ting quality.

But as the sun begins to set, Robin's song takes on a new and exquisitely different character.

From sunset until dark, a Robin adds ethereal whispered notes to its carol, creating a song of remarkable grace and complexity.

Let's listen more closely to the fine detail of a Robin's evening song by slowing down the same notes to half normal speed.

Here's another passage of evening song at half speed.

In the high latitudes, where twilight lingers late into the evening, a Robin may expand its daytime carols into a twilight symphony that continues for hours.

For BirdNode, I'm Michael Stein.