I'm not just saw but photographed great blue herons, but I never see this "digital blue" before.
Even if they are get a little blue colored never get this dark unrealistic blue. I'm not just not seen in real life but even not on photograps a blue like this.
Otherwise they are more gray than blue, only their name is Blue heron not their real color.

This picture was taken on a Fuji Astia which have the most realistic colors. This is the real color of the Great blue herons. And this is more gray than blue.