Watercolor portrait of Green Heron (Butorides virescens)

Green Heron

Butorides virescens
Breeds across the southern half of Canad… Shallow fresh or brackish wetlands inclu… Uncommon Advertising "skow" series

Learn to identify the Green Heron by ear. Master the "skow-skow-skow" phrase and tell it apart from similar species.

skow-skow-skow

What the Green Heron sounds like

A small, stocky heron that often appears hunch-shouldered with its neck drawn in. Up close the bird flashes rich colors: a glossy green-black cap and back, deep chestnut neck and chest, slate wings edged in teal, and a dagger-like bill ideal for spearing prey. Green Herons are famous for their patience, standing statue-still at the water’s edge before striking lightning-fast at fish and amphibians. They are also one of the few birds documented using tools—dropping insects, feathers, or twigs onto the water surface to lure fish within reach.

skow-skow-skow

How to tell it apart

Listen for:A low, repeated "skow" or "skuk" given by males at dawn and dusk from hidden perches during courtship; carries well across marshes. Often written as skow-skow-skow.
Don't confuse with:The Black-crowned Night-Heron — bulkier with shorter neck and thick gray body.

Where you'll hear it

Shallow fresh or brackish wetlands including ponds, marshes, mangrove edges, slow streams, canals, and vegetated lake margins. Requires overhanging branches or emergent vegetation for perches and nest sites.

Migratory in the north: arrives in spring (Apr–May), breeds through summer, and departs by early fall (Aug–Oct). Year-round presence in subtropical and tropical parts of range.

Similar species

Black-crowned Night-Heron

Bulkier with shorter neck and thick gray body.

Least Bittern

Much smaller (sparrow-sized) with buffy-orange tones.

Striated Heron (Butorides striata)

Old World counterpart with grayer neck and white throat line.

Green Heron sound FAQ

What does a Green Heron sound like?
A low, repeated "skow" or "skuk" given by males at dawn and dusk from hidden perches during courtship; carries well across marshes. Listen for the "skow-skow-skow" phrase.
How do I tell a Green Heron from a Black-crowned Night-Heron by sound?
Black-crowned Night-Heron: Bulkier with shorter neck and thick gray body.; Adult has black crown but pale gray back, not green.; Often active at dusk; flight call is a deeper croak..
When is the best time to hear a Green Heron?
Migratory in the north: arrives in spring (Apr–May), breeds through summer, and departs by early fall (Aug–Oct). Year-round presence in subtropical and tropical parts of range.