Watercolor portrait of Cerulean Warbler (Setophaga cerulea)

Cerulean Warbler

Setophaga cerulea
Uncommon Buzzy rising song

Learn to identify the Cerulean Warbler by ear. Master the "zray zray zray zreee!" phrase and tell it apart from similar species.

“zray zray zray zreee!”

What the Cerulean Warbler sounds like

A fast series of thin, buzzy notes that seems to climb and speed up at the end. It carries from the treetops like a tiny electric squeak.

How to tell it apart

Listen for: “zray zray zray zreee!”
Don't confuse with the Blue-gray Gnatcatcher. Acts more restless and gives sharper, nasal calls.

Where you'll hear it

A long-distance migrant. It breeds in the eastern United States and a small part of southern Ontario, then winters in the northern Andes of South America.

In summer, look high in mature deciduous forests with towering oaks, sycamores, hickories, and tulip trees. In winter, it shifts to humid Andean foothill and montane forests, often along wooded slopes.

It arrives late in spring, when males sing from the highest branches like little blue exclamation points. Peak activity is during breeding season; on migration it can be brief, scattered, and easy to miss.

How to recognize it by sight

A tiny treetop warbler with a flash of sky-blue and a fast, buzzy song. Males look crisp and cool with white underparts and dark blue streaks; females are softer blue-green and much subtler, but just as fond of the canopy.

Similar species

Northern Parula

Usually smaller and more compact.

Black-throated Blue Warbler

Male has a solid dark blue back and a bold black face and throat, not Cerulean's white throat and necklace look.

Blue-gray Gnatcatcher

Much longer tail with constant tail-flicking.

Cerulean Warbler song FAQ

What does a Cerulean Warbler sound like?
A fast series of thin, buzzy notes that seems to climb and speed up at the end. It carries from the treetops like a tiny electric squeak. Listen for the "zray zray zray zreee!" phrase.
How do I tell a Cerulean Warbler from a Blue-gray Gnatcatcher by sound?
Blue-gray Gnatcatcher: Acts more restless and gives sharper, nasal calls.
When is the best time to hear a Cerulean Warbler?
It arrives late in spring, when males sing from the highest branches like little blue exclamation points. Peak activity is during breeding season; on migration it can be brief, scattered, and easy to miss.