I have been watching these two swans in a pond by where I work. They hatched three baby swans, I think two died and now they raised one. A white crane that looks like them but much smaller hung around for a few weeks and never left their side, always right where they were. Now this week both the baby swan (who grew up) and this white crane are gone. Only the mom and dad are left.. Where would they go? or what do you think happened to them?