white heron fishing on a swampy pond

white heron fishing swampy pond aigrette american egret animal behavior ardea beak beaked beast big bill bionomics bird guide birding tours casmerodius albus clear water common ecology egretta alba environment feed feeding forage making fowl graceful great hunting fish ichthyophagous javelin lake lance leggy mountain ornithology peaceful pecker piscivore piscivorous reflections throwing spear watching appetitive behaviour behaviour pond caught small threw air