You are very welcome. If the swan still has some grey, then he is under a year old. So, he may have arrived with his parents or the other swans and was too tired to travel on. Hopefully, he will get his energy level back and will leave to meet up with the flock. He probably knows the area and the flock may be in the surrounding immediate area for him to meet up. If not, he may stay and take your area as his habitat as long as it has ample food, shelter, water, nesting and other resources needed by the swan. Eating is a good sign that he is health and knows how to get food. The Regal Swan