great white heron hunting for fish on pond

heron wintering sri lanka bird hunting fish pond great white aigrette american egret animal behavior ardea beak big bill guide birding tours casmerodius albus ciconiiformes clear water common ecology egretta alba environment feed feeding fisheating birds forage making fowl ichthyophagous large leggy longnecked longshanks ornithology pecker pike piscivore piscivorous throwing spear watching lanka