It is a large (24"-34"), chunky, brown bird, very similar to the American Bittern, Botaurus lentiginosa.
This bittern is usually well-hidden in Phragmites reedbeds. Usually solitary, it walks stealthily seeking amphibians and fish. If it senses that it has been seen, it becomes motionless, with its bill pointed upward, causing it to blend into the reeds. It is most active at dawn and dusk.
Folk names: barrel-maker, bog-bull, bog hen, bog-trotter, butterbump.