Watercolor portrait of American Bittern (Botaurus lentiginosus)

American Bittern

Botaurus lentiginosus
American Bitterns breed across much of s… Freshwater marshes are prime territory,… Uncommon Booming marsh call

Learn to identify the American Bittern by ear. Master the "pump-er-lunk" phrase and tell it apart from similar species.

“oong-KA-chunk! ... pump-er-lunk!”

What the American Bittern sounds like

A chunky, streaky heron that looks like it was woven from cattails. American Bitterns lurk low in marshes, then freeze bolt upright with the bill pointed skyward, almost vanishing into the reeds. In spring, the male’s deep, gulping boom can carry across the marsh long before you ever see the bird.

“pump-er-lunk”

How to tell it apart

Listen for:A deep, resonant, three-part gulping boom that seems to rise right out of the reeds. It carries far across calm marshes, especially at dawn, dusk, and on still spring nights. Often written as “oong-KA-chunk! ... pump-er-lunk!”.
Don't confuse with:The Least Bittern — much smaller and slimmer, but still a small heron — about 11–14 inches long, not sparrow-sized.

Lessons featuring the American Bittern

Ready to test your ear? Practice identifying the American Bittern's sounds in these interactive in-app lessons.

Marsh Mystery Voices lesson habitat
Marsh Mystery Voices
Tier 5 · Wet Feet & Watchpoints
Waterline Radio lesson habitat
Waterline Radio
Tier 8 · Edges & Echoes
Marsh Secret Agents lesson habitat
Marsh Secret Agents
Tier 9 · Niche Voices
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Where you'll hear it

Freshwater marshes are prime territory, especially broad cattail marshes, sedge meadows, wet prairies, and marshy pond edges. They also use brackish marshes and flooded fields during migration and winter.

Spring is the best time to notice them, when males give their famous booming call from hidden marsh perches. In summer they stay secretive in tall vegetation, while fall migrants may appear at marsh edges and winter birds skulk through southern wetlands.

Similar species

Least Bittern

Much smaller and slimmer, but still a small heron — about 11–14 inches long, not sparrow-sized.

Eurasian Bittern

Very similar overall but found in Europe, Asia, and parts of Africa, not North America.

Immature Black-crowned Night-Heron

Also brown and streaky, but shorter-necked, chunkier, and more compact overall.

American Bittern sound FAQ

What does an American Bittern sound like?
A deep, resonant, three-part gulping boom that seems to rise right out of the reeds. It carries far across calm marshes, especially at dawn, dusk, and on still spring nights. Listen for the "pump-er-lunk" phrase.
How do I tell an American Bittern from a Least Bittern by sound?
Least Bittern: Much smaller and slimmer, but still a small heron — about 11–14 inches long, not sparrow-sized.; Adult Least Bittern shows rich chestnut and black on the back rather than the American Bittern’s overall buffy, heavily streaked look.; Usually has a paler face pattern and lacks the same bold, thick dark malar stripe impression..
When is the best time to hear an American Bittern?
Spring is the best time to notice them, when males give their famous booming call from hidden marsh perches. In summer they stay secretive in tall vegetation, while fall migrants may appear at marsh edges and winter birds skulk through southern wetlands.