"Upright and Spread Wing is also a feeding ground display shown by the Great Blue and Sumatran Heron. Two herons encounter each other, spread their wings, fan their tail, droop and spread their wings, extend their neck and head high over back, and become more vertical as the display continues."
Kushlan, J. A. 2011. The terminology of courtship, nesting, feeding and maintenance in heronswww.HeronConservation.org
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