Great Blue Heron breeds from southeastern Alaska and coastal British Columbia east to the Gaspe Peninsula and Nova Scotia south to Mexico, the West Indies and Galapagos Islands. Winters from coastal British Columbia, central United States, and southern New England south to northern South America.

Status in British Columbia
Sedentary or migratory. Resident on the coast, where it is very common in the south, common in the north and fairly common on the Queen Charlotte Islands. Fairly common resident in the southern interior where waters do not freeze. Widespread breeder in southern British Columbia; local breeder on north coast.

Nests were large stick platforms (n=93) up to 1 m in diameter and 38 cm in depth. The nest cup was a shallow depression lined with small twigs, bark strips, fresh evergreen boughs, or rushes. Dates for 137 clutches ranged from 1 April to 2 July. Clutch size ranged from 1 to 8 eggs. Incubation period is 25 to 29 days (Harrison, C. 1978).

Numbers appear to be increasing throughout southern areas of the interior but the magnitude of the increase is not known. Recently, high levels of organochlorine residues have been found in egg contents from heronries on the south coast and: Vancouver Island.

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