The Bittern is a thickset heron with all-over bright, pale, buffy-brown plumage covered with dark streaks and bars. It flies on broad, rounded, bowed wings. It is very difficult to see as it moves silently through reeds at water's edge. The males make a remarkable far-carrying, booming sound in spring. Its feather colour is black, brown, cream/buff and white, it has brown-green legs and the beak is black, brown, long, powerful and chunky. Its length is 70-80cm and the wingspan 1.3m.