Hi David
The young swan may have been chased by his parents which usually happens once the juveniles get older, may have gotten lost from the rest of the flock during the winter migration to your location, or is using your site as a stopover until it leaves to rejoin his flock. If there are other swans in your area, it means that there is ample food resources for the swans until they leave in the spring. The Mute Swans will teach him where to find food. Since he is a juvenile, he is probably leery of people. Once he figures out the other swans are getting fed by you, he will probably get smart enough to realize he also wants more food. It just make take some time. As long as your pond/lake does not freeze over, he should be able to find food and will be fine. Thanks for caring for the swans. The Regal Swan