This is where herons get tricky. Is this a great blue heron or just a common grey heron? Typically grey herons are more clearly divided by white and grey with a very distinctive black eyebrow band, whereas the great blue tends to be bluer grey with less white and a less pronounced black eyebrow. I shall leave the viewer to decide on this one. If you wish to compare them check the photo of the grey heron being mobbed by a crow on a previous page.