 |
|
 |
 |
 |
ID-FRONTIERS for November 19-25, 2006
[ Prev Week
| Next Week
| Calendar Month
| ID-FRONTIERS Info
]
|
Messages are displayed in the order they were received.
|
| Subject | From | Date | Time |
| FW: Junkin's Warbler | Geoff Malosh | Sun, 19 Nov 2006 | 3:25pm |
| Re: Indiana Mystery Gull | Bell, Tyler | Mon, 20 Nov 2006 | 11:11am |
| A Gull from Finland | Visa Rauste | Mon, 20 Nov 2006 | 3:11pm |
| Fwd: woodpecker sighting | Rob Jett | Mon, 20 Nov 2006 | 6:12pm |
| Re: A Gull from Finland | Frode Falkenberg | Tue, 21 Nov 2006 | 4:15am |
| Ring-necked Duck or hybrid? | Ottavio Janni | Tue, 21 Nov 2006 | 6:45am |
| Re: Ring-necked Duck or hybrid? | Lee Evans | Tue, 21 Nov 2006 | 8:04am |
| Re: Ring-necked Duck or hybrid? | Bruce Deuel | Tue, 21 Nov 2006 | 9:33am |
| Gulls, general aging question | Matt Sharp | Tue, 21 Nov 2006 | 10:00am |
| Re: Indiana Mystery Gull | Floyd Hayes | Tue, 21 Nov 2006 | 11:02am |
| Unidentified Jaeger | Hugh McGuinness | Tue, 21 Nov 2006 | 12:40pm |
| Re: Unidentified Jaeger | Tim Avery | Tue, 21 Nov 2006 | 12:56pm |
| Re: Unidentified Jaeger | Bruce Deuel | Tue, 21 Nov 2006 | 12:59pm |
| Re: Unidentified Jaeger | Bruce Deuel | Tue, 21 Nov 2006 | 1:03pm |
| Re: Unidentified Jaeger | Phil Pickering | Tue, 21 Nov 2006 | 2:20pm |
| Re: Gulls, general aging question | GreatGrayOwl(AT)AOL.COM | Tue, 21 Nov 2006 | 4:13pm |
| Re: Gulls, general aging question | Martin Reid | Tue, 21 Nov 2006 | 4:56pm |
| Re: Unidentified Jaeger | =?iso-8859-1?Q?Pierr | Wed, 22 Nov 2006 | 3:55am |
| Re: Unidentified Jaeger | Lee Evans | Wed, 22 Nov 2006 | 5:59am |
| Sandwich Tern identification | Norman D.van Swelm | Wed, 22 Nov 2006 | 3:36pm |
| Aythya duck sp. | Kenneth Rude Nielsen | Fri, 24 Nov 2006 | 1:16pm |
|
To use email addresses replace '(AT)' with '@'.
This is done to confuse the spam 'bots.
|
[ << | >> | ^^ ]
Subject: FW: Junkin's Warbler
From: Geoff Malosh <pomarine(AT)EARTHLINK.NET>
Date: 19 Nov 2006 3:25pm
This is a multi-part message in MIME format.
----INCLUDING text/plain MIME SECTION----
Hi all,
I've received a number of off-list messages from people wondering if I
heard anything back on my request about Junkin's Warbler. Willie D'Anna
sent me the message below with the answer and gave me permission to
forward it to the list.
It looks like it may be as many as six more months before Cornell
finally shares the results with the public. The good news is that they
did identify the parents definitively.
Geoff Malosh
Pittsburgh, Pennsylvania
-----Original Message-----
From: Willie D'Anna & Betsy Potter
Sent: Saturday, November 18, 2006 4:48 AM
To: Geoff Malosh
Subject: Junkin's Warbler
Hi Geoff,
I saw your question on ID-Frontiers. I spoke briefly with Dave Junkin
while looking at the Batavia Wheatear. He told me that he was not at
liberty to reveal the results because there was going to be an article
in The Living Bird (the Cornell Lab. of Ornith.) about it and they were
going to present the photos as a quiz. He said they would not have the
answer until the following issue!
I recently received an issue of Living Bird and there was nothing in
there about it. So, perhaps in three months I will get the article and
the answer will follow three months later. Hope I don't die first...
Cheers,
Willie
----------
Willie D'Anna
Betsy Potter
Wilson, NY
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
----DELETED text/html MIME SECTION----
[ << | >> | ^^ ]
Subject: Re: Indiana Mystery Gull
From: "Bell, Tyler" <belljt(AT)SI.EDU>
Date: 20 Nov 2006 11:11am
Here's a photo of Shrimpy, the Maryland Kelp Gull, with the underwing
fully extended:
http://www.fordham.edu/lewis/birds/Kelps/kelp7.JPG
The photo of the Indiana bird looks pretty much identical. Small, single
mirror on P10, large white trailing edge on the wing, dark triangle on
primaries and secondaries. GBBGs have two large mirrors on P9 and P10
which often blend into one large spot not at all like the Indiana bird.
Here's another photo, in full sun, which shows there is some difference
in gray scale between the primaries and the mantle. On the extended
wing, from above, this feature is not as obvious:
http://www.fordham.edu/lewis/birds/Kelps/ckelp.JPG
This looks like the second photo of the Indiana bird. The mantle looks
way too dark, and uniformly so, to have any GBBG ancestry. The two
photos also show a similar, wide tertial crescent which is not present
on GBBG.
Another couple of characteristics that are additional strikes against
GBBG are bill and leg color. 3rd year GBBGs might have a Dijon colored
leg but they always have a black ring or smudge on the bill. However, to
have a bill without any black (fully mature), the legs will be pink.
I don't claim to be an expert on gulls but my wife and I did spend
considerable time studying the Maryland KEGU as well as the plentiful
GBBGs nearby, as Shrimpy was only 10 miles from our house. It looks good
to me as a pure KEGU using Shrimpy as a model.
Tyler Bell
belljt(AT)si.edu
California, MD
Subject: Indiana Mystery Gull
From: Tim Avery <tanager AT TIMAVERYBIRDING.COM>
Date: Sat, 18 Nov 2006 18:27:18 -0700
I submit for your comments, photographs taken by Ken Brock of a mystery
Gull
from Michigan City, Indiana earlier this November:
http://timaverybirding.com/brock_mystery_gull.html
Any comments are welcome.
Cheers,
Tim Avery
Indianapolis, IN and Salt Lake City, UT
http://www.timaverybirding.com
http://www.birdtography.com
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
[ << | >> | ^^ ]
Subject: A Gull from Finland
From: Visa Rauste <rauste(AT)CC.HELSINKI.FI>
Date: 20 Nov 2006 3:11pm
Dear BIRDWG01 people,
I would like to hear comments (on this list or privately) from
people familiar with smithsonianus and (preferably) argentatus
Herring Gulls, on a first-winter gull photographed in Finland
(Northern Europe) in the past week:
http://www.helsinki.fi/~rauste/gulls/jussi2.html
http://www.helsinki.fi/~rauste/gulls/jussi3.html
--
Visa Rauste
Visa.Rauste(AT)Helsinki.FI, tel +358-9-19144146
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
[ << | >> | ^^ ]
Subject: Fwd: woodpecker sighting
From: Rob Jett <citybirder(AT)earthlink.net>
Date: 20 Nov 2006 6:12pm
All,
I just received the following forwarded e-mail. It sounds intriguing and don't
know what to make of it (and don't want to just ignore it, either). As far as
I've been able to find there haven't been any reports of this species in NYS.
What about the rest of the US?
I may have some time tomorrow to take a look around, if anyone else is in the
area it could be worth doing some searching.
Good birding,
Rob
--------------------------------------
------ Forwarded Message
From: Bill Murdoch <murdoch(AT)lifesci.ucsb.edu>
Reply-To: murdoch(AT)lifesci.ucsb.edu
Date: Sun, 19 Nov 2006 16:07:01 -0800
To: info(AT)brooklynbirdclub.org
Subject: woodpecker sighting
Hullo,
I am trying to inform a relevant birding group of a possible European
Green Woodpecker seen in Brooklyn Botanic Gardens on Sunday November 12
in the late morning.
We were walking along the park path adjacent to the road that separates
the park from the Museum. We had no bins with us. A green woodpecker
flew into one of the trees on the left of the path. The back of the
head was red. It looked to me like a European Green Woodpecker, which I
have seen fairly often in the UK, but I am not sure the red covered the
top as well as the back of the head (a feature I didn't notice was
relevant till I looked up by European bird book back home).
I'd be interested in a response to this email, especially an opinion on
any other species it might be.
Bill Murdoch (Santa Barbara)
------ End of Forwarded Message
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
[ << | >> | ^^ ]
Subject: Re: A Gull from Finland
From: Frode Falkenberg <Frode.Falkenberg(AT)SKOLELAB.UIB.NO>
Date: 21 Nov 2006 4:15am
Hi!
I suppose L. a. smithsonianus may look like this, but the slightly
blotchy underparts and too little dark barring on the undertail coverts
makes this a non-classical smithsonianus in relation to the variation we
see in L. a. argentatus here in coastal Norway. The tail, GC and tertial
pattern is not outside the northern Herring Gull variation.
Two quite similar birds:
http://cyberbirding.no/gull/hg/1w_14.php
http://cyberbirding.no/gull/ufo/1w_01.php
A dark-bellied arg:
http://cyberbirding.no/gull/hg/1w_15.php
All the best,
Frode Falkenberg
http://gull.cyberbirding.no/
Visa Rauste wrote:
> Dear BIRDWG01 people,
>
> I would like to hear comments (on this list or privately) from
> people familiar with smithsonianus and (preferably) argentatus
> Herring Gulls, on a first-winter gull photographed in Finland
> (Northern Europe) in the past week:
>
> http://www.helsinki.fi/~rauste/gulls/jussi2.html
> http://www.helsinki.fi/~rauste/gulls/jussi3.html
>
> --
> Visa Rauste
> Visa.Rauste(AT)Helsinki.FI, tel +358-9-19144146
>
>
> Join or Leave BIRDWG01:
> http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
>
> Archives: http://listserv.arizona.edu/archives/birdwg01.html
--
Frode Falkenberg
Skolelaboratoriet i realfag, UiB
Allegaten 41
5007 Bergen
Tlf: 55 58 22 25
www.miljolare.no
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
[ << | >> | ^^ ]
Subject: Ring-necked Duck or hybrid?
From: Ottavio Janni <coeligena(AT)HOTMAIL.COM>
Date: 21 Nov 2006 6:45am
----INCLUDING text/plain MIME SECTION----
Hello all,
=20
This putative Ring-necked Duck was recently photographed in Liguria, NW Ita=
ly:
=20
http://www.ebnitalia.it/gallery/moretta_co.htm
=20
I have not seen the bird in the field, but some features leave me (and seve=
ral other people who have seen the bird or photographs of it) a bit perplex=
ed. The main one is head shape, which in the photos never really looks like=
the typical head shape of Ring-necked Duck, but rather more like a female =
Tufted Duck. The dirty brown wash on the flanks, the apparent lack of the w=
hite vertical stripe bordering the black breast, and the rather broad bill =
shape are also causes for concern. I know that there are cases of hybridisa=
tion involving Ring-necked Duck, and I am wondering if the Italian bird cou=
ld be one such individual. I used to see lots of Ring-necked Ducks when I w=
as in the U.S., but since they were common and easy to identify I never pai=
d much attention to them, so now I can't remember if they can ever look lik=
e this (maybe a 2cy male? Or a bird moulting out of eclipse plumage, althou=
gh mid-Nov seems very late for that).
=20
Any comments are much appreciated.
=20
Cheers,
=20
Ottavio Janni
Italy
_________________________________________________________________
All-in-one security and maintenance for your PC.=A0 Get a free 90-day trial=
!
http://www.windowsonecare.com/purchase/trial.aspx?sc_cid=3Dwl_wlmail=
Join or Leave BIRDWG01:
http://listserv.arizona.edu/cgi-bin/wa?SUBED1=3Dbirdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
----DELETED text/html MIME SECTION----
[ << | >> | ^^ ]
Subject: Re: Ring-necked Duck or hybrid?
From: Lee Evans <LGREUK400(AT)AOL.COM>
Date: 21 Nov 2006 8:04am
----INCLUDING text/plain MIME SECTION----
This is an odd looking bird, especially the brown colouring on the neck, but
I have never seen a Ring-necked Duck hybrid with such a perfect bill pattern.
I suspect that it is an adult drake Ring-necked Duck still moulting out of
eclipse, but I do agree that it is rather late for this. The brightness of the
eye certainly indicates that the bird is an adult rather than a juvenile making
its plumage that more interesting. Vagrant juvenile Ring-necked Ducks in
Britain do not begin to resemble 'adult-type Ring-necked Ducks' until at least
December and often not until February
Good Birding Always
Lee G R Evans
British Birding Association
UK400 Club, Rare Birds Magazine & Ornithological Consultant
Discussion Forum/Email Group: _http://groups.yahoo.com/group/UK400Club/_
(http://groups.yahoo.com/group/UK400Club/)
Email Address: LGREUK400(AT)aol.com
Website Address: _www.uk400clubonline.co.uk_
(http://www.uk400clubonline.co.uk/)
8 Sandycroft Road
Little Chalfont
Amersham
Buckinghamshire
England
HP6 6QL
Telephones: 01494 763010 and 01494 581157
Mobile/Text Alerts: 07881 906629
(Lee Evans Enterprises incorporate documentation of rare bird occurrences in
Britain & Ireland and elsewhere in the Western Palearctic and in North
America; Rare Bird Information and Rare Bird Alerts; Rare Birds Magazine and
other
related publications; Bird Tours for Birders; also Mobile Discos (Nighthawk
Roadshow); CD Vinyl & DVD Sales; Haynes Car Manuals For Sale; Prestige Car
Delivery; UK Courier and Road Traffic Officer)
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
----DELETED text/html MIME SECTION----
[ << | >> | ^^ ]
Subject: Re: Ring-necked Duck or hybrid?
From: Bruce Deuel <BDEUEL(AT)DFG.CA.GOV>
Date: 21 Nov 2006 9:33am
I fully agree with Lee's comments, but am most puzzled by the head
shape, which should look like that of the female in the 2 bottom
pictures. I've never noticed a head shape like this bird in the many
Ring-necked Ducks I see here in northern California, but I can't offer
an explanation for it, either. The bird does appear to be an adult male
Ring-necked Duck coming out of eclipse.
Cheers,
Bruce Deuel
Redding, California USA
>>> Lee Evans <LGREUK400(AT)AOL.COM> 11/21/2006 7:04 AM >>>
This is an odd looking bird, especially the brown colouring on the
neck, but
I have never seen a Ring-necked Duck hybrid with such a perfect bill
pattern.
I suspect that it is an adult drake Ring-necked Duck still moulting out
of
eclipse, but I do agree that it is rather late for this. The brightness
of the
eye certainly indicates that the bird is an adult rather than a
juvenile making
its plumage that more interesting. Vagrant juvenile Ring-necked Ducks
in
Britain do not begin to resemble 'adult-type Ring-necked Ducks' until
at least
December and often not until February
Good Birding Always
Lee G R Evans
British Birding Association
UK400 Club, Rare Birds Magazine & Ornithological Consultant
Discussion Forum/Email Group:
_http://groups.yahoo.com/group/UK400Club/_
(http://groups.yahoo.com/group/UK400Club/)
Email Address: LGREUK400(AT)aol.com
Website Address: _www.uk400clubonline.co.uk_
(http://www.uk400clubonline.co.uk/)
8 Sandycroft Road
Little Chalfont
Amersham
Buckinghamshire
England
HP6 6QL
Telephones: 01494 763010 and 01494 581157
Mobile/Text Alerts: 07881 906629
(Lee Evans Enterprises incorporate documentation of rare bird
occurrences in
Britain & Ireland and elsewhere in the Western Palearctic and in North
America; Rare Bird Information and Rare Bird Alerts; Rare Birds
Magazine and other
related publications; Bird Tours for Birders; also Mobile Discos
(Nighthawk
Roadshow); CD Vinyl & DVD Sales; Haynes Car Manuals For Sale; Prestige
Car
Delivery; UK Courier and Road Traffic Officer)
Join or Leave BIRDWG01:
http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
[ << | >> | ^^ ]
Subject: Gulls, general aging question
From: Matt Sharp <sharp(AT)ACNATSCI.ORG>
Date: 21 Nov 2006 10:00am
Does anyone on the list have a strong opinion
or know of any research showing whether bare
part coloration or plumage pattern are better indicators
of age in gulls?
Outside of primary shape it seems to me that plumage
has more potential for variation given the energy costs
associated with molt. But other than the simplified
answer of 'hormones' I am not sure how changes in bare
parts, and especially iris color, are regulated and to what
extent diet and or health relate to those changes.
I guess part of my hope in this question is to get a sense of
whether bare-part color or plumage is a more reliable way to
age birds in photos.
Thanks
Matt
Matt Sharp
Collection Manager
VIREO/ANS
1900 Benjamin Franklin Pkwy.
Philadelphia PA 19103
http://vireo.acnatsci.org
(tel.) 215-299-1069
(fax) 215-299-1182
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
[ << | >> | ^^ ]
Subject: Re: Indiana Mystery Gull
From: Floyd Hayes <floyd_hayes(AT)YAHOO.COM>
Date: 21 Nov 2006 11:02am
One strike against the Indiana bird being a "pure"
Kelp Gull is the heavy streaking on the head.
Floyd Hayes
Hidden Valley Lake, CA
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
[ << | >> | ^^ ]
Subject: Unidentified Jaeger
From: Hugh McGuinness <hmcguinness(AT)ROSS.ORG>
Date: 21 Nov 2006 12:40pm
This is a multi-part message in MIME format.
----INCLUDING text/plain MIME SECTION----
I would appreciate comments on the identity of a Jaeger found 75 miles
south of Shinnecock Inlet (Suffolk Co., NY) on 9 September 2006 by John
Shemilt. Photos can be seen at
http://www.ross.org/~hmcguinness/EEBirds/CurrP/unkjaeger.htm
=20
Hugh
=20
Hugh McGuinness
The Ross School
18 Goodfriend Dr.
East Hampton, NY 11963
631-907-5229 (no messages)
631-697-2099 (cell)
=20
Join or Leave BIRDWG01:
http://listserv.arizona.edu/cgi-bin/wa?SUBED1=3Dbirdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
----DELETED text/html MIME SECTION----
[ << | >> | ^^ ]
Subject: Re: Unidentified Jaeger
From: Tim Avery <tanager(AT)TIMAVERYBIRDING.COM>
Date: 21 Nov 2006 12:56pm
Oh does this bring back memories for anyone else on the list?
I would say this bird is a little more straightforward and looks good for
Long-tailed Jaeger in my opinion. The two white primary shafts along with the
bill seem to call out LTJA!
Cheers,
Tim Avery
Indianapolis, IN and Salt Lake City, UT
http://www.timaverybirding.com
http://www.birdtography.com
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
[ << | >> | ^^ ]
Subject: Re: Unidentified Jaeger
From: Bruce Deuel <BDEUEL(AT)DFG.CA.GOV>
Date: 21 Nov 2006 12:59pm
This is a group I have much trouble with, but shouldn't Long-tailed
Jaeger show a nice contrast between dark secondaries and lighter
coverts, which I don't see here?
>>> Tim Avery <tanager(AT)TIMAVERYBIRDING.COM> 11/21/2006 11:56 AM >>>
Oh does this bring back memories for anyone else on the list?
I would say this bird is a little more straightforward and looks good
for
Long-tailed Jaeger in my opinion. The two white primary shafts along
with the
bill seem to call out LTJA!
Cheers,
Tim Avery
Indianapolis, IN and Salt Lake City, UT
http://www.timaverybirding.com
http://www.birdtography.com
Join or Leave BIRDWG01:
http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
[ << | >> | ^^ ]
Subject: Re: Unidentified Jaeger
From: Bruce Deuel <BDEUEL(AT)DFG.CA.GOV>
Date: 21 Nov 2006 1:03pm
Okay, that was my humble opinion, now I'm even humbler, as I realize
that character may only apply to adults?
Cheers,
Bruce Deuel
Redding, CA
>>> Bruce Deuel <BDEUEL(AT)DFG.CA.GOV> 11/21/2006 11:59 AM >>>
This is a group I have much trouble with, but shouldn't Long-tailed
Jaeger show a nice contrast between dark secondaries and lighter
coverts, which I don't see here?
>>> Tim Avery <tanager(AT)TIMAVERYBIRDING.COM> 11/21/2006 11:56 AM >>>
Oh does this bring back memories for anyone else on the list?
I would say this bird is a little more straightforward and looks good
for
Long-tailed Jaeger in my opinion. The two white primary shafts along
with the
bill seem to call out LTJA!
Cheers,
Tim Avery
Indianapolis, IN and Salt Lake City, UT
http://www.timaverybirding.com
http://www.birdtography.com
Join or Leave BIRDWG01:
http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
Join or Leave BIRDWG01:
http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
[ << | >> | ^^ ]
Subject: Re: Unidentified Jaeger
From: Phil Pickering <philliplc(AT)CHARTER.NET>
Date: 21 Nov 2006 2:20pm
http://www.ross.org/~hmcguinness/EEBirds/CurrP/unkjaeger.htm
Classic Long-tailed head shape - skull appears to be quite short and
rounded rather than elongated, forehead/bill angle appears very steep in all
shots, figure 5 shows (apparently) diagnostic for L-t pinched look to the
face
between the eyes where it meets the bill, overall flight profile is
comparatively
blunt. Also good for L-t - relatively compact and narrow body/wings, 2 white
P-shafts, and (on my monitor) tail covert barring appears cold and stark.
Also
if I recall correctly the paler patch on the lower breast between the
solidly dark
upper breast and more filled-in belly is also supposed to be a L-t mark on
young birds, not typically shown by Parasitic.
Cheers,
Phil Pickering
Lincoln City, Oregon
philliplc(AT)charter.net
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
[ << | >> | ^^ ]
Subject: Re: Gulls, general aging question
From: GreatGrayOwl(AT)AOL.COM
Date: 21 Nov 2006 4:13pm
----INCLUDING text/plain MIME SECTION----
Hi Matt and the rest of the gang:
Ooh, what a poser! I really don't like any particular aspect of gull
appearance as any more reliable an ageing criterion in white-headed gulls. Eye
color is notoriously variable, at least for the first couple years of life.
Bill color and pattern seems exceedingly variable, too, in the first 2-3 years
of age for most species. And, finally, plumage pattern is incredibly
variable.
I look at the problem as multivariate, usually going with the age that is
best supported by multiple features. Of course, what we really need is more
and more extensive studies of known-age birds to get a better feel for
individual variation.
Tony Leukering
Brighton, CO
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
----DELETED text/html MIME SECTION----
[ << | >> | ^^ ]
Subject: Re: Gulls, general aging question
From: Martin Reid <upupa(AT)AIRMAIL.NET>
Date: 21 Nov 2006 4:56pm
Dear All,
I think that all students of gulls have to wrestle with this issue,
and from what I've been able to figure (from the wisdom of others
plus study of my own), there is no single feature that is reliable.
More-so, most features are about as reliable/unreliable as each
other. But I would suggest that one element may, on average, be the
most reliable indicator of age: The pattern of the primaries. These
are the most expensive, energy-wise, feathers on any gull, I would
guess that they have a longer "gestation" period than other feathers.
I think that the type of pattern that eventually appears on a flight
feather (retrices, secondaries and primaries) is governed by a
complex amalgam of overall health, condition of the in-place feather
for that sheath, food supply, ambient conditions, and hormone levels
- all of which can affect exactly when the replacement feather forms
in the sheath. I can't offer any logical explanation, but my gut
tells me that the primaries will be the least subject to those
variations, due to the expense involved. I know of an example of
three British HERGs banded together from the same parents - these
birds were controlled four years later, and if memory serves me, one
looked like a third-cycle, one like a fourth-cycle, and one like an
adult - primaries and all.
Nevertheless, I personally use the primaries when I'm struggling with
a bird; I know I'll be wrong sometimes, but I reckon I'll be wrong
less often than if using any other feature.. I'd be interested in the
thoughts of others on this - thanks.
Martin
--
Martin Reid
San Antonio, Texas
mailto:upupa(AT)airmail.net
http://www.martinreid.com
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
[ << | >> | ^^ ]
Subject: Re: Unidentified Jaeger
From: =?iso-8859-1?Q?Pierre-Andr=E9_CROCHET?= <pierre-andre.crochet(AT)CEFE.CNRS.FR>
Date: 22 Nov 2006 3:55am
the pale breast patch, grey breast band and pale neck collar are diagnostic of
intermediate Long tailed according to the Olsen book. The long tail projection
is equally diagnostic, in addition to the characters already mentioned by
others. If they could all come like that...
P.
Pierre-André Crochet
CNRS-UMR 5175 Centre d'Ecologie Fonctionnelle et Evolutive
1919, route de Mende
34293 Montpellier cedex 5
France
tel: + 33 6 07 32 60 75 (mobile)
+ 33 4 67 61 32 98 (office)
fax: + 33 4 67 41 21 38
pierre-andre.crochet(AT)cefe.cnrs.fr
-----Message d'origine-----
De : NBHC ID-FRONTIERS Frontiers of Field Identification
[mailto:BIRDWG01(AT)LISTSERV.ARIZONA.EDU] De la part de Phil Pickering
Envoyé : 21 November 2006 22:11
À : BIRDWG01(AT)LISTSERV.ARIZONA.EDU
Objet : Re: [BIRDWG01] Unidentified Jaeger
http://www.ross.org/~hmcguinness/EEBirds/CurrP/unkjaeger.htm
Classic Long-tailed head shape - skull appears to be quite short and rounded
rather than elongated, forehead/bill angle appears very steep in all shots,
figure 5 shows (apparently) diagnostic for L-t pinched look to the face between
the eyes where it meets the bill, overall flight profile is comparatively blunt.
Also good for L-t - relatively compact and narrow body/wings, 2 white P-shafts,
and (on my monitor) tail covert barring appears cold and stark.
Also
if I recall correctly the paler patch on the lower breast between the solidly
dark upper breast and more filled-in belly is also supposed to be a L-t mark on
young birds, not typically shown by Parasitic.
Cheers,
Phil Pickering
Lincoln City, Oregon
philliplc(AT)charter.net
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
--
passerelle antivirus du campus CNRS de Montpellier
--
--
passerelle antivirus du campus CNRS de Montpellier
--
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
[ << | >> | ^^ ]
Subject: Re: Unidentified Jaeger
From: Lee Evans <LGREUK400(AT)AOL.COM>
Date: 22 Nov 2006 5:59am
----INCLUDING text/plain MIME SECTION----
Hi Hugh
First of all let me congratulate you on a fine selection of photographs -
excellent stuff. Secondly, I see no doubt that your bird is an intermediate
morph
juvenile LONG-TAILED SKUA - it shows the entire suite of features allowing
confirmation of this to be made, all of which have been excellently summarised
by previous writers
Lee G R Evans
British Birding Association
UK400 Club, Rare Birds Magazine & Ornithological Consultant
Discussion Forum/Email Group: _http://groups.yahoo.com/group/UK400Club/_
(http://groups.yahoo.com/group/UK400Club/)
Email Address: LGREUK400(AT)aol.com
Website Address: _www.uk400clubonline.co.uk_
(http://www.uk400clubonline.co.uk/)
8 Sandycroft Road
Little Chalfont
Amersham
Buckinghamshire
England
HP6 6QL
Telephones: 01494 763010 and 01494 581157
Mobile/Text Alerts: 07881 906629
(Lee Evans Enterprises incorporate documentation of rare bird occurrences in
Britain & Ireland and elsewhere in the Western Palearctic and in North
America; Rare Bird Information and Rare Bird Alerts; Rare Birds Magazine and
other
related publications; Bird Tours for Birders; also Mobile Discos (Nighthawk
Roadshow); CD Vinyl & DVD Sales; Haynes Car Manuals For Sale; Prestige Car
Delivery; UK Courier and Road Traffic Officing)
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
----DELETED text/html MIME SECTION----
[ << | >> | ^^ ]
Subject: Sandwich Tern identification
From: "Norman D.van Swelm" <Norman.vanswelm(AT)wxs.nl>
Date: 22 Nov 2006 3:36pm
Radioactive Robins has been updated with a Sandwich Tern section where an
attempt is made to bring clarity in the identification of the American race
acuflavida versus the Old world race sandvicensis. Have a look at:
http://members.lycos.nl/radioactiverobins/
Please feel free to respond.
All the best,
Norman Deans van Swelm
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
[ << | >> | ^^ ]
Subject: Aythya duck sp.
From: Kenneth Rude Nielsen <kenneth.r.nielsen(AT)netfugl.dk>
Date: 24 Nov 2006 1:16pm
Hi
Please take a look at the pictures of an aythya duck sp. It was discovered by
Copenhagen Birder Rasmus Strack few days ago. It is still present in a lake near
by Copenhagen. All comments are very welcome.
http://netfugl.dk/pictures.php?species_id=936&country_id=1&photographer_id=236&pics_section=&picture_category_id=&rare_bird=&picdate_year=2006&picdate_month=&picdate_day=&order_by=&order=&page_size=25&id=listpictures&search=1&language=uk
Best regards
Kenneth Rude Nielsen
Join or Leave BIRDWG01: http://listserv.arizona.edu/cgi-bin/wa?SUBED1=birdwg01
Archives: http://listserv.arizona.edu/archives/birdwg01.html
|
 |
 |
 |