Great Blue Heron Ardea herodias


Bradley, N. L.; Leopold, A. C.; Ross, J.; Huffaker, W. 1999. Phenological changes reflect climate change in Wisconsin. Proceedings of the National Academy of Sciences of the United States of America 96: 9701-9704.

IUCN. 2020. The IUCN Red List of Threatened Species. Version 2020-3. Available at: (Accessed: 10 December 2020).

Meehan, T. D.; LeBaron, G. S.; Dale, K.; Michel, N. L.; Verutes, G. M.; Langham, G. M. 2018. Abundance trends of birds wintering in the USA and Canada, from Audubon Christmas Bird Counts, 1966-2017, version 2.1. New York, New York, USA

Pardieck, K. L.; Ziolkowski Jr., D. J.; Lutmerding, M.; Hudson, M. A. R. 2018. North American Breeding Bird Survey Dataset 1966 - 2017, version 2017.0. U.S. Geological Survey, Patuxent Wildlife Research Center Available at:

Partners in Flight. 2019. Avian Conservation Assessment Database, version 2019. Available at:

Wetlands International. 2020. Waterbird Population Estimates. Available at:

Further resources

Search for photos and videos, and hear sounds of this species from the Macaulay Library

Recommended citation
BirdLife International (2021) Species factsheet: Ardea herodias. Downloaded from on 17/01/2021. Recommended citation for factsheets for more than one species: BirdLife International (2021) IUCN Red List for birds. Downloaded from on 17/01/2021.