青鷺[aosagi] grey heron (Ardea cinerea)
黒鷺[kurosagi] eastern reef heron
大鷺[daisagi] great (white) egret
白鷺[shirasagi] generic name for herons with all-white plumage (inc. egrets)
朱鷺[shuro] Japanese crested ibis (Nipponia nippon)

五位鷺[goisagi] black-crowned night heron (Nycticorax nycticorax)
若鷺[wakasagi] Japanese pond smelt (Hypomesus nipponensis)
鷺草[sagisou] fringed orchid
箆鷺[herasagi] common spoonbill (Platalea leucorodia)

お歯黒[ohaguro] tooth blackening
暗黒期[ankokuki] eclipse period
暗黒時代[ankokujidai] Dark Ages
暗黒大陸[ankokutairiku] Dark Continent (i.e. Africa)
黒い[kuroi] black

黒い霧[kuroikiri] thick fog
黒くする[kurokusuru] to blacken
黒ずむ[kurozumu] to blacken
黒っぽい[kuroppoi] dark