Hi, I am a new owner of two Pekins,(3 months) and I've been "lurking" on this site, finding the answers to all my questions, without even having to ask them! However, I do have one that I haven't seen addressed, or maybe I don't know what it's called, but I'm calling it the "air quack" Occasionally they open their bills wide, but make no sound. They do it several times in a row. It is not panting. You can see some movement down in their necks as well. Both the male and the female do it, and they do it both in and out of the water. Any ideas?