This is the swan on her nest at Boston's public garden which I posted earlier about to <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/clairity/148664294/">take a dip</a>.  I think I saw her good-sized youngster doing backflips nearby.  The groundskeepers kept this corner cordoned off so the mom could have some privacy.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/38315261@N00">Sharon Mollerus</a> from Duluth, USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/38315261@N00/148817322/">Swan's Nest</a>