<p>Sea Otter Mom with Two Pups, Morro Bay, CA 16april2007.  Photo by Mike Baird <a rel="nofollow" class="external text" href="http://bairdphotos.com">bairdphotos.com</a> Canon 5D 600mm IS on tripod.
</p><p>You have to look closely (see the full-res version at <a rel="nofollow" class="external text" href="https://www.flickr.com/photo_zoom.gne?id=462500055&amp;size=o">flickr.com/photo_zoom.gne?id=462500055&amp;size=o</a> ) - the Mom on the left is harboring two pups - the eye of the second is at the far left of the image... the otter to the right is presumed to be an adult.  Thanks to Joyce Cory for the observation.
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Additional note from <a href="//commons.wikimedia.org/wiki/User:Clayoquot" title="User:Clayoquot">user:Clayoquot</a>: If the two pups at lower left are indeed twins, this would be extremely rare as mothers can usually only care for one infant. Orphaned pups in aquariums need round-the-clock feeding, grooming, and attention from exhausted human staff! It is quite possible that the two small pups are unrelated, as unrelated pups often play together. The pup on the right looks like a juvenile rather than a full-grown adult.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/72825507@N00">Mike Baird</a> from Morro Bay, USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/72825507@N00/462500055/">sea-otter-mom-and-pup-4-16-07_2</a>