There is a 10 month old swan on our lake that seems to be sick. He will not eat and is spending most of his time with his beak tucked under his wing…just floats in the water. He has been like this for the past three days. Air temperature has been down to single digits each night. The mom and dad are still around, eating and they seem to be doing fine. Any thoughts on what might be wrong with the young one? « Hide