English and Scientific names:

Black-whiskered Vireo (Vireo altiloquus)

Number of individuals: 

1 adult

Locality: LOUISIANA: 

Jefferson Parish

Specific Locality:

Landry-LeBlanc Tract of the Nature Conservancy on Grand Isle, off of Sureway Road (also known as the Sureway Woods)

Date(s) when observed:

29 April 2006

Time(s) of day when observed:  

Observed at 0730h

Reporting observer and address:

Justin Bosler

Baton Rouge, LA

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

Anne Bechard

Other observers who independently identified the bird(s)

Karen Fay

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

Semi-dark lighting conditions with early morning light under moderate to heavy cloud cover

Optical equipment: 

Zeiss Victory FL 8x42, brand new condition

Distance to bird(s): 

10-12 meters

Duration of observation:

Approximately 1 minute


Vireo located in a small live oak (Quercus virginiana) next to a substantial patch of cane

Behavior of bird: 

The vireo flew into view from the live oaks adjacent to the cane, and once in view the vireo sat still on the live oak branch for approximately 1 minute, where I was able to see the diagnostic features of V. altiloquus. After this brief encounter, the BWVI retreated in the direction in which it had appeared. Main reason for losing tract of the BWVI was in an attempt to summon other observers not too far from the location.


At first a larger vireo sp. flew into view, and once perched, the black malar stripes were visible along with a considerably bulky bill in relation to the head. Other less distinct characters included a pale olive-green back, off-white underparts with olive tinged flanks, red irides, and a strong contrasting black and white supercilium.


No voice heard

Similar species:

Red-eyed Vireo was eliminated by the black malar character, and likewise, the yellow-green vireo was also eliminated by this same character.

Photographs or tape recordings obtained?

No photographs or voice recordings taken.

Previous experience with this species: 

Seen on one occasion in S Florida, and one other encounter at the Peveto Woods Sanctuary, Cameron Parish, Louisiana; 1 May 2005.

Identification aids:

at time of observation:
No identification aids used at time of observation.
after observation:

No identification aids used after the observation.

This description is written from: 

This description has been written solely from memory.

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


Yes, I am confident of this identification.


Justin Bosler

Date and time: 

8 May 2006 at 0105h