A survey of nesting colonies of Great Blue Herons (Ardea herodias) was made in Alberta from May to August, 1967, as part of a Canadian Wildlife Service program to protect endangered birds.Most heronries were located by asking biologists, wardens, and naturalists if they knew of nesting colonies in their Vermeer, Kees.1969."Great Blue Heron Colonies in Alberta."The
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Kees Vermeer (1969) studied this question.
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