Crossley Bird ID Guides

Crossley ID Guides
  • Home
  • Bird ID Guide
  • Events
  • Videos
  • Books
  • Recommendations
    • Birder Gift Guide
    • Birding Optics
    • Photography Gear
  • About
    • Contact Richard Crossley
Black-throated Blue Warbler
Setophaga caerulescens
Black-throated Blue Warbler Setophaga caerulescens
BTBW

Bird Description

Fairly common in deciduous woods, usually in damp areas under the canopy. In late fall often eats pokeberries. Song a slow buzzy 'zi zee zee zee zee' ('I am so lay-zee'). Call a hard 'tek,' junco-like. Tends to move slowly and often just appears at head height. ID: A fairly large and robust, neckless warbler. Young birds are essentially the same as respective-sex adults. All have white square patch at base of primaries, reduced in younger birds, particularly ?. This is striking in flight, showing as a wing bar on already pale underwing. Ad ?: striking black around face and flanks contrasting with blue upperparts and white underparts. 1styr ?: green tips to upperparts, sometimes pale flecking in throat. Southern/Appalachian population can show dark mantle streaking and lack green in youngsters. Ad ?: dull green above, dirty buff below. Always look for distinctive face pattern: dark ear covers set off by pale border with pale eyelid. Pale base to primaries can be hidden or nearly absent, but diagnostic when present.


Share this:

  • Facebook
  • LinkedIn
  • Twitter
  • Tumblr
  • Pinterest

Find Photos, Descriptions, Range Maps, and More in These Crossley ID Guides


Gear Guides
Nikon AF-S FX NIKKOR 18-35mm f/3.5-4.5G ED Zoom Lens
Birder Gift Guide
Perky-Pet Window Mount Hummingbird
R4B
Race 4 Birds is a foundation created by Richard Crossley, Tim Keyes, and Connie Campanella to promote youth birding competitions. Please check us out and "join the chase" at www.Race4Birds.org
Pledge to Fledge today!
Hawk Mountain
It was my honor to sit on the board at Hawk Mountain Sanctuary. They are pioneers in many areas of research, education and conservation. Visit them at www.HawkMountain.org.

Richard Crossley

Avatar photoRichard Crossley is an internationally acclaimed birder and photographer who has been birding since age 7. His love of the outdoors and his interest in teaching, design, and technology have shaped his unique vision for the future of birding and bird books. He lives with his wife and two daughters in Cape May, New Jersey. Read More…

Copyright © 2025 Richard Crossley · All Rights Reserved