A number of warblers (perhaps most?) have high chip alarm calls different to the typical chip call, sounding more like titmice or Golden-crowned Kinglet. They seem to be heard most often on breeding grounds and are often given by birds that are highly agitated; in this way they seem homologous to the high chip call of the Song Sparrow.
Female Pine Warbler in the pine barrens (Jun, NJ).
Female Blackburnian Warbler, Blue-headed Vireo in background (Jul, ME)
Kentucky Warbler female with nearby fledgling (which looked just like a House Wren with a faint moustache and yellow under the tail), giving a high chip, an intermediate chip, and the regular low chip (June, NJ).
high chip
intermediate chip
all 3 chips (reduced time scale)
Yellow Warbler adult with food (June, NJ).
Worm-eating Warblers near nest (June, NJ).
Hooded Warbler (male, June, PA).
An agitated Common Yellowthroat male giving high chips, the regular chip call, and a couple of intermediate calls (July, PA).
high chip
the first six chips (reduced time scale), the third is the regular chip
Compare with the chip calls (regular and high) of an adjacent agitated Song Sparrow (July, PA).
v-shaped high chip of Song Sparrow
Another male Common Yellowthroat, some of the calls are cardinal-like (May, PA).
Chestnut-sided Warbler adult near fledgling, giving high-pitched and other chips (July, ME).
Presumed Palm Warbler (I didn't observe the bird that made this call but no other species were present in a flock of eastern Palm Warblers, Apr, PA).
Miscellaneous other calls
Ovenbirds have a variety of calls. This high call is distinctive in sound (June, NJ).
Birds of the World Online previously The Birds of North America Online (BNA). Comprehensive information on all aspects of life history, including audio and video. By subscription.
Birdsong by the Seasons. Donald Kroodsma, Houghton Mifflin, 2009. Another great book with CDs from Dr Kroodsma.
Flight Calls of Migratory Birds WR Evans and M O'Brien. CD-ROM www.oldbird.org. Excellent source of information on flight calls
Nature's Music, The Science of Birdsong. Peter Marler and Hans Slabbekoorn. Elsevier Academic press. 2004. A treasure trove of information, advanced but very readable (comes with CD).
Peterson Field Guide to Bird Sounds of Eastern North America. Nathan Pieplow, 2017. Highly recommended, includes almost all known vocalizations of eastern US birds, with spectrograms and detailed analysis. Excellent!
Stokes Field Guide to Bird Song, Eastern Region, by Lang Elliot. 3 CDs. Of commercial recordings, this has the most comprehensive collection of songs and calls.
The Singing Life of Birds. Donald Kroodsma, Houghton Mifflin, 2005. Terrific book (plus CD), a must read.
The Songs of Wildbirds. Lang Elliott., Houghton Mifflin, 2005. Excellent photos with high quality recordings including some rare ones such as the flight song of the Western Meadowlark.
The Sound Approach to Birding. A guide to understanding bird sound. A. van de Berg, M Constantine, M. Robb. Superb discussion of bird calls and song with 2 CDs.
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