English and Scientific names: |
Red-throated
Loon (Gavia stellata)
|
Number of individuals: |
One basic adult |
Locality: LOUISIANA: |
Jackson Parish |
Specific Locality: |
Caney Creek Reservoir, Womack |
Date(s) when observed: |
24 January 2009 |
Time(s) of day when
observed: |
9:20AM - 3:30 PM
CST |
Reporting observer and address: |
Devin Bosler Baton Rouge, LA |
Other observers accompanying reporter who
also identified the bird(s): |
Justin Bosler |
Other
observers who independently identified the bird(s): |
Terry Davis,
Charles Lyon (24 Jan 2009), Mac Myers, Paul Conover, m. ob. (25 Jan 2009) |
Light
conditions (position of bird in relation to shade and to direction and amount
of light): |
Overcast sky with
low ceiling and low lighting. Sun
glare or backlighting not a problem. |
Optical equipment: |
Zeiss Victory FL
8x42, Nikon Fieldscope w/ 20-60x optical zoom, Canon Powershot SD1100 IS (all equipment in good condition) |
Distance to
bird(s): |
ca. 150-300
meters |
Duration of
observation: |
off and on for 3+
hrs from mid-morning through late afternoon |
Habitat: |
Relatively deep,
manmade freshwater lake in upland mixed pine-hardwood forest. Lake reaches a depth of 60+ ft. in three
sections, which makes it one of the deepest lakes in LA. |
Behavior of bird/birder: |
The Red-throated
Loon was observed swimming, diving, preening, and at rest. It was first spotted as it surfaced amid a
tight foraging group of Common Loons and Double-crested Cormorants. Light rain and strong, gusty NE winds made
it difficult to stay on the loon and obtain digiscoped photos. For the remainder of the day, the loon was
frequently diving and swimming, usually far from shore in the deeper
water. It was continuously on the
move, covering a broad area of the lake, especially during the morning
hours. Often, the loon would spend
one-two minutes underwater on a dive.
In the afternoon, it paused occasionally to preen and rest before
diving again. |
Description: |
A relatively small, delicate loon with dark
upperparts and white underparts. White
speckling and feather edges visible on back.
Entirely white face, throat, and breast with a sharply demarcated dark
silvery-gray crown and hindneck.
Small, beady eye isolated on unmarked white face, below the dark
crown. Thin, slightly upturned dark
bill. Dark irides. |
Voice: |
No, silent.
COLO were heard during the AM. |
Similar
species: |
Common Loon
(COLO) can be eliminated by slender, less robust build, relatively small head
proportional to body, and thin, dark upturned bill. RTLO rests lower to the water’s surface than most loons,
especially COLO. RTLO also lacks the
chest bulge observed in other loons.
Pacific Loon (PALO) shows a darker face and neck, and adults with dark
chinstrap. On PALO, the upperparts
are less patterned in winter and the eye is concealed within the dark on the
face. Also, the bill on PALO is
straighter and stout, not slightly upturned or held at an angle as in
RTLO. |
Photographs
or tape recordings obtained? |
Yes, digiscoped
photos attached. Photos by Devin
Bosler. |
Previous
experience with this species: |
Previous
experience with this species from Atlantic coast from Maine south to Delaware
and Pacific coast in Washington. Very
familiar with this species. |
Identification aids: |
National
Geographic Complete Birds of N.A. (Alderfer et al. 2005). |
This description is written from: |
notes made during
the observation, notes made after the observation, memory. |
Are
you positive of your identification? If not, explain: |
Yes. |
Reporter: |
Devin
Bosler
|
Date and time: |
28
January 2009 4:00 PM CST |