June is when nestlings appear in most great blue heron colonies in Maine. In Maine, great blue herons lay their eggs anytime between late April and mid-May. After approximately 27 days of incubation, the nestlings hatch out mostly unfeathered except for pale gray down that appears a bit bushy on the crown. They weigh less than 2 ounces at hatching and can barely hold their heads up. Within a week or two they can be seen poking their heads above the edge of the nest bowl, especially when their parents return to the nest to provide food. Within 7-8 weeks, the nestlings will grow to adult size, weighing in at 4.5 lbs and standing about 3 ft tall. Check out a video clip of a heron nest with nestlings taken by Deb Dutton on Facebook!