Here is a part of one of the nicest poems about bird song you’ll ever read, written by that Sage of Nature, Gary Snyder. This is why we listen to birds.
The Canyon Wren
I look up at the cliffs
But we’re swept on by downriver
Wobble and slide over roils of water
under the arching stream
Rock walls straight up on both sides.
A hawk cuts across that narrow sky
hit by the sun,
We paddle forward, backstroke, turn,
Spinning through eddies and waves
Stairsteps of churning whitewater.
above the roar
hear the song of a Canyon Wren.
A smooth stretch, drifting and resting.
Hear it again, delicate downward song
Descending through ancient beds. . . .
These songs that are here and gone,
Here and gone,
To purify our ears.
Here is a link so you too can listen, at least, to a recording. May it inspire you to get out there and hear one for yourself.