We think of Great Blue Herons as not being on the vulnerable list, but the Pacific Great Blue is. Industrial and human development are the biggest threats. The quiet wooded areas they need to nest, are decreasing. A disturbance may cause them to leave their nest; leaving their vulnerable chicks open to being preyed upon by Bald eagles. Watching one for hours as it feeds under the docks, is a pleasure we should all be able to enjoy.