Okay, I want to revisit this topic. I have not made these yet and had so many ideas swimming around in my mind I couldn't cement just one and so had almost given up. My son and I talked about several different ways to do this, and there are so many! But I settled on what I think will work for me given my materials, time and abilities. (Meaning, I already have the stuff and not much time to do it! LOL)
I will make 3 birds facing frontward, using the Finding Nemo seabirds
http://i44.photobucket.com/albums/f48/Hel380/mine.jpg for inspiration. I will make them with foam core backing for stability, polyfoam over the front, covered with white fabric and some white feathers for added layer/texture. The feet will be mounted on the ship mast, or rope or wherever we decide to put them. One puppeteer will work the beak of the middle bird and the other two beaks will be connected with a small black dowel, not sure exactly what I will use, but something light and stiff. So when the puppeteer sings and sways the middle bird they will all sing and sway.
Does this make sense? Do you think it will work?