Record #: 13-B-07

Idaho Bird Records Committee Rarities Report Form

Species: Chestnut-sided Warbler

Reporter: Jay Carlisle

6105 Kirkwood Rd

Boise, ID 83709

jaycarlisle@boisestate.edu

Other Observers: Ryan Brady, Fred Van Hove, Josie Fenton, & more (all IBO field crew members)

Date Report Prepared: 2-4-07

Date Sighting Occurred: 9-3-01 (capture)

Locality of Observation: Lucky Peak, Ada Co.

Habitat: mixed Douglas fir forest and mountain deciduous shrub at 5900’

Conditions: I do not remember

Did you take notes? not at all

Did you consult a field guide or other reference work? during the observation

What guide(s) or reference(s) did you consult?

Pyle’s 1997 ‘The Identification Guide to North American Birds’, Sibley, National Geographic

Description: A small Dendroica warbler with white spots in a dark tail; a bright greenish back and crown; grayish face and auriculars; and whitish below. Wing 61mm and tail 48mm.

Based on incomplete skull development and plumage, this bird was identified as an immature (hatch-year). Extensive white tail spots and dark centers to back and uppertail feathers suggested an immature male.

Behavior: This was a bird captured as part of a standardized bird migration study at 950am on 9-3-01.

How and when did you positively identify the bird, and what clinched the identification for you? Clinching features included bright greenish coloration to back and crown, gray cheeks, and the whitish tail spots.

How did you eliminate similar species, and what were they? Chestnut-sided Warbler is a very straight-forward identification given good views. The combination of gray auriculars, wing bars, and extensive tail spots eliminate all other warblers with yellowish/greenish upperparts.

Experience with this species (and similar species): I have observed many hundreds, if not thousands, during breeding season, migration and winter in both the US (especially Connecticut and South Dakota) and Central America (especially Panama). I have also since captured and handled 3 immature Chestnut-sided during fall migration at Lucky Peak and Camas NWR in Idaho.

General birding experience: extensive; 14+ years in US and Latin America

Were photo(s), video, and/or audio obtained by you? (If yes, please include or attach) Yes, but not by me. See attached photos taken by Ryan Brady.