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VTBIRD  September 2008

VTBIRD September 2008

Subject:

Jaegers at Charlotte Town Beach

From:

Jim Osborn <[log in to unmask]>

Reply-To:

Vermont Birds <[log in to unmask]>

Date:

Tue, 16 Sep 2008 23:34:03 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (64 lines)

Today (9/16/08) there were 5 different jaegers present off Charlotte Town 
Beach between the hours of 6:40 AM and 7:10 AM. Four of these birds were 
Pomarine and the fifth one went unidentified. The following is a summary of 
the birds seen:

BIRD #1: Bulky with broad wings and "clean" bold white underparts, a dark 
black cap covering the eye and crossing the chin, light yellow wash below the 
cap, white nape, mottled heavy breast band that DID NOT close around the 
breast, extensive white patch at the base of the upperwing, white in outer 
primaries, dark brown back, dark flanks, and central tail feathers that 
were "twisted" and extended well beyond the rest of the tail. ADULT LIGHT-
MORPH POMARINE JAEGER (Possible MALE bird)

BIRD #2: Bulky with broad wings and bold white underparts, some minor 
barring along side under wing-pits, black cap covering eye and crossing the 
chin, white nape and chin, mottled heavy breast band that fully closed around 
breast, extensive white patch at the base of the upperwing, white "flashes" in 
primaries, dark brown back, dark flanks and undertail coverts, and central tail 
feathers that "twisted" and extended beyond the rest of the tail. ADULT 
LIGHT-MORPH POMARINE JAEGER

BIRD #3: Bulky with broad wings and bold white underparts, a dark black cap 
covering the eye and crossing the chin, some yellow below the cap line, white 
nape, mottled heavy breast band that fully closed around the breast, 
extensive white patch at the base of the upperwing, white "flashes" in the 
extreme outer primaries, dark brown back, dark flanks, and central tail 
feathers that "twisted" and extended beyond the rest of the tail. ADULT 
LIGHT-MORPH POMARINE JAEGER

BIRD #4. Bulky with broad wings, dark upperparts, and pale belly. Primaries 
were dark with light streaking along the outer feathers. Extensive barring on 
breast, upper tail coverts, and on rump. The central tail feathers of this bird 
were rounded and extended slightly beyond the rest of the tail. JUVENILE 
POMARINE JAEGER

BIRD #5. Much smaller, more slender ALL DARK bird with NO apparent white 
markings of any kind. No sign of any extensions on tail when bird fanned it in 
mid-flight. Behavior was key for this species. The bird chased several Ring-
billed Gulls before moving north towards the Four Brothers. Flying into a slight 
head-wind, it behaved like a shearwater flying back and forth and "cutting" 
the wind. JAEGER SPECIES

Behavior of Birds #1 and #2: These two Adult Pomarine Jaegers moved south 
together down the lake. They chased a few gulls as well as each-other. They 
also attacked several Double-crested Cormorants feeding on the surface. 
They remained in view for approxiately 15 minutes before moving out of sight  
south of the town of Essex, NY.

Behavior of Birds #3 and #4: These two Pomarine Jaegers moved south 
together down the lake approximately half-a-mile behind the Adult jaegers. 
They interacted the whole time. The adult Pomarine chased a few Ring-billed 
Gulls while the Juvenile just followed along. They stayed close together 
throughout the 15-20 minutes that it took them to move south of Essex, NY 
and out of sight.

Behavior of Bird #5: This ALL DARK Jaeger showed the characteristic "chase" 
behavior as it moved north up the Lake. The fact that it was "shearing" the 
wind made me think that it could be a Long-tailed. However, the visibility to 
the north did not allow for any conclusive evidence to support that theory. I 
had to let it go as simply a JAEGER (sp).

Jim Osborn
South Burlington

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