What was that?

This was one of the harder hikes that we tackled on our trip.  That generally means fewer people away from the trailhead as well, which turned out to be the case.

We have the lake to ourselves when we got there.  After lunch we lounged for a bit but then heard some rather loud rustling in the heavy brush that came right up to the lake edge.  Not knowing what it was, we decided to head back a bit earlier than we otherwise had planned.