About American Bittern
Has a large stocky body with thicker neck than herons; smallest of the four large bitterns; feathers are brown, with fine streaks and spots; dark black patch on neck; olive streak of bare skin at base of long dagger-like yellow bill; eyes yellow, legs green; underparts streaked brown and white.
Their nests are made on a platform of bulrushes of catstails among dense cover, built up on the water or lodged in the vegetation just above it, sometimes on the land. They have 4-5 brown to olive buff eggs. The female takes care of the eggs for 28-29 days.
American Bittern is active at dusk and during the night. It is a solitary bird, standing quietly and slowly stalking its prey. It has the nickname of “Thunder-pumper” or “Stake-driver” because of the song it sings during the breeding season.
Bitterns react to danger by adopting an elongated posture with the bill pointing up to the sky.