Great Blue Heron in Flight #2

Great Blue Heron in flight at Lake Kittamanqundi. I was observing two caspian terns circling around the lower portion of the lake when I saw something large fly by. I thought it was a hawk at first but realized it was a heron after bringing my lens up and focusing it. It was flying along the eastern shore of the lake where I was standing, maybe just 15 or so feet away. I consider this to be my best flight picture of a heron I have taken so far.

Lens - Tamron 100-400mm f/4.5-6.3 Di VC USD @ 400m on Nikon D5500