Green Herons breed throughout the eastern half of North America. After their nesting season is over they tend to wander, often to more favorable foraging areas. This dispersal merges gradually into a protracted fall migration for birds in the Northeast, beginning around the end of August, with most birds having left by mid-October.
Most Green Herons from eastern United States migrate south to winter along the Gulf of Mexico, Florida, Caribbean islands, Mexico, through Central America to northern South America. We usually see our first Green Herons returning in mid-April, earlier than other herons. This may be due to their crepuscular feeding habits, which gives them a longer span of time to feed each day.
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