English and Scientific names:

Glaucous Gull (Larus hyperboreus)

Number of individuals: 

one in subadult plumage

Locality: LOUISIANA: 


Specific Locality:

Isles Dernieres, east spit of Trinity Island

Date(s) when observed:

Sunday, May 11, 2008

Time(s) of day when observed:  

7:30 am

Reporting observer and address:

Cecilia Leumas


Baton Rouge, LA

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


Katie Percy

Other observers who independently identified the bird(s):


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

bird was flying past in open area under bright, partly cloudy skies

Optical equipment: 

10x42 binoculars, good condition

Distance to bird(s): 

about 50m

Duration of observation:

about 1 minute


sand spit on barrier island, low elevation, almost no vegetation. 

Behavior of bird: 

Bird was flying low over the shoreline along the bay side of the island along with many Laughing Gulls.  I was conducting behavioral observations on a tern and skimmer decoy plot from a blind about 50m away.


The gull was significantly larger than the LAGUs around it, looked about HERG size or larger (some HERG were in the area as well, though not in the same field of view).  It was all white, no gray or brown markings visible, with light pink legs and large, light pink bill with black tip.  The wings seemed broad in flight. 



Similar species:

Too large for Iceland Gull, too white for Glaucous-winged Gull.

Photographs or tape recordings obtained?


Previous experience with this species: 

I have seen this species before, on San Clemente Island, CA.

Identification aids:

  1. at time of observation: Katie Percy
  2. after observation: Justin Bosler, Sibley guide to birds

This description is written from: 

      notes made during the observation


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




Cecilia Leumas

Date and time: 

5/13/08____Time: 9:30 pm