Great blue heron rookery inside Marymoor Park Redmond, Wa
Herons nest in colonies, often called rookeries or heronries. Heronries are usually in isolated spots away from potential disturbance and near suitable feeding areas.
Herons that have been frequently exposed to human (or dogs in this off leash park) disturbance may be more tolerant and may nest in large public parks and greenbelts.
Herons begin returning to a colony to breed in February and March. Nest building begins in March or April.
Three to five pale, greenish-blue eggs are incubated for 25-29 days by both sexes.
Young first fly at around 60 days of age and leave the nest at 65-90 days, at which time they are similar in size to adults.
Great blue herons have one brood (clutch) per year, however, they may renest if their first clutch fails.
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