Herons exhibiting an "Upright and Spread Wing" feeding ground threat display" behavior at Blackwater NWR.
A narrative description of this behavioral display is provided in the "Great Blue Heron Threat Display
" menu item located at the top right hand side of this page.
Ref: Kushlan, J. A. 2011. "The terminology of courtship, nesting, feeding and maintenance in herons
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