Looks like Frank & Frieda went else where tonight. You can see their empty nest.
Actually,it was a tad windy so they went to the lee of the island to wait it out.
This whole area floods at high tide. That root ball got swept down stream during a high rain event! The stream swells tremendously during heavy rainstorms. The fast flowing water undercuts the trees along side the bank & they fall into the raging stream. The trees are then unceremoniously carried downstream to a new resting place.