Sounds of Ducks, Geese, and Swans

After the great blockbuster weekend in Southern Lorain County centered around Findley State Park, I have a greater awareness of those talented individuals with an ear for birds. Hearing a bird is just as good a way to document its presence as seeing, maybe better.
If you want to hear the sounds of birds the Cornell Lab of Ornithology lets you listen online. As an introduction, try these wetland birds for a variety of sounds. If you like those try others. CD's with high quality nature recordings are not cheap. Allaboutbirds.org presents this digital content in a well organized and useful method.