Behavior
Great blue herons are mainly active in the mornings and at dusk when fishing is best. They are stalk-and-strike hunters that visually locate prey and thus hunt during daylight. They are solitary predators however, they do often breed in rookeries and during the night they will sleep with flocks of over 100 other herons. Great blue herons are also extremely territorial and will aggressively defend their nests. This species is mostly migratory, but populations of the southern United States may remain in one region year-round.