If you listen closely to this soundscape you’ll hear a low sound that sounds a little like “ker-plunk, ker-plunk”… That’s a species of bird called the American Bittern. Low frequency sound travels better through the dense reeds. So, the lower voice of the American Bittern allows them to communicate with one another through the busy soundscape of the marsh!
Tune into KRCB.org (104.9 FM Sonoma County) to listen for the current segment. Ear to the Wild is a short interstitial segment aired somewhat randomly throughout the day between other programs. They use shorts and postcards to fill airtime during breaks from Morning Edition and All Things Considered. Also during their music programing, as needed. Greta Mart tends to air them during her show around 4:47 or 5:47.
Check out these links for more information about the American Bittern:
Petaluma Wetlands Alliance: “Oonk-a-lunk” American Bittern
Sonoma County Birdwatching Spots: American Bittern
All About Birds: American Bittern
Audubon: American Bittern