Thanks to all who responded to my inquiry earlier. Of the nine responses I received, here were the "votes": Pied-billed Grebe: 4 Black-billed Cuckoo: 2 Virginia Rail: 1 Green Heron: 1 Least Bittern: 1 Â When I saw all the suggestions for Pied-billed Grebe, I realize that I didn't even mention that in my original post! To clarify, I've heard many Pied-billed Grebes, and this vocalization did not have the explosive and decelerating quality of a grebe. It did not have the rail tone to its voice either; it wasn't high strung or fast enough to resemble a rail. I've also heard Green Herons doing their knocking call, which I find to be faster and less deliberate (if you will) than the mystery call of mine. Black-billed Cuckoos usually sing their song many times in a row, and not once every thirty-ish seconds, which is what "my" bird was doing. This song was also very slow and even-paced for a bird song, which is what threw me off. I'm wondering if I was only able to hear part of the song? Maybe I was missing some introductory notes of some weird alternate Black-billed Cuckoo or Least Bittern vocalization? I guess if I were forced to give this vocalization an identification, I would still say Least Bittern. But because I remain uncertain, I probably won't eBird it. Sigh. Â Good birding! Â Alyssa DeRubeis Stevens Point, Portage Co. #################### You received this email because you are subscribed to the Wisconsin Birding Network (Wisbirdn). To UNSUBSCRIBE or SUBSCRIBE, use the Wisbirdn web interface at: //www.freelists.org/list/wisbirdn To set DIGEST or VACATION modes, use the Wisbirdn web interface at: //www.freelists.org/list/wisbirdn Visit Wisbirdn ARCHIVES at: //www.freelists.org/archives/wisbirdn