Back in the eighties, after having a huge amount of experience spotting 
swan collars for Dr. Sladen's collar banding program, which had slowed 
down by that time,  I was traveling south out of Still Pond, Kent County, 
Md., when I noticed a single Swan standing alone in a corn field. Thinking 
it may be a lead poisoning victim, I stopped and scoped it for a better 
look.  (I thought it unusual for a Whistling [now Tundra] Swan to be 
alone.)  The bird was clearly a Trumpeter Swan. All the field marks were 
present-size, neck posture,bill color,V , etc.  I reported this bird to 
Horsehead and to others who received these reports then. I got no 
immediate response.  I called back and was told that the Trumpeters which 
Dr. Sladen had at Horsehead had been unpinioned and released before he 
left their organization.  They assumed that the bird I saw was one of 
those.          When the Eared Grebes were sighted  at the Ridgely sewer 
ponds recently, there were three.  Maybe they habitually come out of their 
normal range in small cliques.