“Little Blue Herons may gain a survival advantage by wearing white during their first year of life. Immature birds are likelier than their blue elders to be tolerated by Snowy Egrets—and in the egrets’ company, they catch more fish. Mingling in mixed-species flocks of white herons, immature Little Blue Herons probably also acquire extra protection against predators.” (Cornell University).
This bird must have been a late hatch since his legs are still the green color of juveniles too.
In the image above I can’t tell if the head shading is a water reflection or blue feathers starting to grow.
This image was taken about 2 miles from the rookery we photograph so I assume this was one of the late bloomers we shot last August.