Hi Marlin. From what you are describing , you are probably seeing what we have also seen in swans and that is a very thick stringy and foamy looking saliva. It is probably due to the swan getting stressed which raises the body temperature even doubling the overheating from the swan after being chased. Provide the swan with some cool water for drinking, DO NOT place any water in the swan's mouth as you can choke it. Let the bird drink on its own. Just make sure it sees the bowl. You can also add some bread and chopped lettuce. Leave the swan in a cool semi dark safe area such as a garage, barn etc. , so that no predator can get to it. A bathroom with sheets lining the floor would work. Wherever you house the swan, place sheets or towels under the swan. DO NOT allow the swan to stay on a slippery surface due to causing leg or foot injuries which could prove lethal if the injuries do not heal properly.

The swan should calm down in about an hour and the thick mucus saliva subsiding. We would still suggest that you get the bird to a vet to insure no further injuries are present. Then we would suggest that it be placed at a waterfowl or wildlife center for a couple of weeks to fully recover. Then we would suggest moving the bird to another area or pond to get it away from the older swan. Otherwise the beatings are going to continue with possible death the result. Just make sure tjat the bird is safe from predatores in the new area. Good luck. Let us know how this progresses. The Regal Swan