Hi everyone. Another question here. One of my ducks started making this sound. As first I thought she was chewing. It has kind of a raspy quality to it. I thought maybe she was panting, so I turned off the heat lamp (my house is 72 degrees). She never stopped the sound. I thought maybe it was shivering, so I turned the lamp back on. She is still doing it. She has plenty of water, food, and seems to be a good temperature. Anyone know what this is??