English and Scientific names:

Bell’s Vireo

Number of individuals: 

1

Locality: LOUISIANA: 

Cameron Parish

Specific Locality:

3.2 km ESE Johnson Bayou school

Date(s) when observed:

14 September 2007

Time(s) of day when observed:  

11:00

Reporting observer and address:

Robert C. Dobbs

Other observers accompanying reporter who also identified the bird(s):

N/A

Other observers accompanying reporter who independently identified the bird(s):

N/A

Light conditions (position of bird in relation to shade and to direction and amount of light):

Mid-day sunlight; bird observed in bright sun and in shade of vegetation where it was foraging

Optical equipment: 

Swarovski 8x30 binoculars

Distance to bird(s): 

12 m

Duration of observation:

2 min

Habitat: 

Hackberry-dominated cheniere forest

Behavior of bird: 

Foraging in vine tangle in subcanopy of hackberry

Description:

Small, olive-yellowish passerine (yellowish primarily on sides, flanks); short, but thick bill; dark iris; indistinct pale area around eye with a faint and indistinct dark eyeline; single thin, white wingbar; relatively long tail (ie given body size/proportions)

Voice:

Bird was singing regularly throughout observation. Song, which I immediately recognized as Bell’s Vireo, was a series of 6-7 raspy phrases that seemed to accelerate slightly or increase in emphasis slightly toward end.

Similar species:

Distinguished from drab warbler (eg Tennessee) based on bill size/shape. Warbling and Philadelphia vireos have very characteristic and clean facial patterns and relatively short tails. Juvenile White-eyed Vireo may have the best potential for confusion, but in addition to plumage and structural (ie relative tail length) differences, the song is very distinctive (and nothing like White-eyed) and confirmed the identification

Photographs or tape recordings obtained?

No

Previous experience with this species: 

I am very familiar with western Bell’s Vireo, having spent extensive time working and birding in Arizona, and with eastern Bell’s Vireo, where I regularly observed breeding birds as an undergrad in northern Arkansas

Identification aids:

Sibley guide, consulted later in day of observation

This description is written from: 

Field notes taken at time of observation

Are you positive of your identification? If not, explain: 

 

Yes, positive of ID

Reporter: 

Robert C. Dobbs

Date and time: 

11:45, 19 December 2007