All week long, we've been playing this sound and asking you to guess what exactly it is and where exactly in the Bay Area we recorded it. This auditory guessing game is part of Audiograph , a crowd-sourced collaborative radio project mapping the Bay Area’s sonic signature. Audiograph tells the story of where you live and the people who live there with you. Every Thursday, we tell you the story behind our weekly mystery sound on Crosscurrents , and here in weekly blog posts. Listen above for the

This is Audiograph — the Bay Area’s sonic signature. Each week, we’ll play you a sound recorded somewhere in the Bay Area. Your job? Listen to the sound in the player above, figure out where it was recorded and what it is, then call to let us know. If you think you can identify this Audiograph sound of the week, call 415-264-7106. Also, tell us where to record next. We’ll give away a KALW t-shirt every week to one lucky caller. We will announce the winner of this week's sound on Thursday during

All week long, we've been playing this sound and asking you to guess what exactly it is and where exactly in the Bay Area we recorded it.

This is Audiograph — the Bay Area’s sonic signature. Each week, we’ll play you a sound recorded somewhere in the Bay Area. Your job? Listen to the sound in the player above, figure out where it was recorded and what it is, then call to let us know.

This auditory guessing game is part of Audiograph , a crowd-sourced collaborative radio project mapping the Bay Area’s sonic signature.

We played you this sound , and asked you to guess what exactly it is and where exactly in the Bay Area we recorded it.

The last of the old Bay Bridge came down a few weeks ago. That means the end of a habitat for the double crested cormorants that nested there. At their height in 2007, more than 1,200 nests were counted in the underbelly of the bridge.

All week long, we've been playing this sound and asking you to guess what exactly it is and where exactly in the Bay Area we recorded it.

This is Audiograph — the Bay Area’s sonic signature. Each week, we’ll play you a sound recorded somewhere in the Bay Area. Your job? Listen to the sound in the player above, figure out where it was recorded and what it is, then call to let us know.

Here's the sound we played as a clue. We asked you to guess what exactly it is and where exactly in the Bay Area we recorded it.