What kind of diving duck is that?

The lake was mostly still but for a few ripples.  I grabbed the binoculars to answer the question:
       What kind of diving duck is that?

Wrong... Not a diving duck! The zoom revealed a River Otter!

I snapped a few photos of what I believed was a solitary otter however I was likely wrong again. This photo zoom captured another creature in the background. Perhaps it's just a fish jumping. Further photo inspection did reveal more than one ripple track.

The otter headed toward the South end of the lake out of my view. I entertained myself by taking photos of fish ripple /tree reflections.

A while later I glanced out and noticed a strong ripple line near the shore headed my direction from the left. Triathletes? No, a bunch of river otter swimming toward my dock!

They were challenging for me to catch in the zoom so close but at least I got a few decent photos my plants...

I did capture a few shots as they met an impasse in the reeds-

 One climbed up on the neighbor's little boat! What is up with that little boat and wildlife?

But all four river otter made it around the obstacles.

A quick Internet search of Lontra canadensis helped define this social otter group. They were likely a mother and 3 young. Eventually the young will head off on their own. 

They are a good indicator of non-polluted water & don't worry I saw plenty of fish jumping after their fishing trip... so they didn't eat up all the trout!