I rename a bird 2 Replies “Indigo Blue Heron” Shading from deep violet to dark gray-blue, the Little Blue Heron is truly indigo-blue. These feather colors just make sense when you put your small heron in front of a saltwater backdrop, as I did here at the causeway. The Indigo Heron begins the hunt, stepping, stopping, stepping again and keeping an eye out for movement. Move slowly, blend in, get ready to strike… …with finger on the shutter button, gotcha. My indigo bird, blogged.