A brook in my city is sometimes home to a pair of swans. I had enjoyed seeing them as I passed the brook. Then a short article in the local newspaper told that one of the pair had died. (They mate for life.) The next Sunday morning on my way to church, as I approached the brook, I noticed a man had parked his car and walked to the edge of the water. The lone swan had come quite close to the man. The man was talking to the swan and the swan was listening intently. I KNOW that it was a condolence call.
The first time I saw swans in someplace other than a zoo was in Geneva, Switzerland - where Lake Geneva runs into the Rhone River. They're pretty majestic birds.