Monthly Archives: November 2010

Northern (or East Siberian) Bullfinch

Still wondering…

I am still wondering about a male Northern Bullfinch I saw near Whitby in late October 2004. The interest in the origins of ‘trumpeting’ Northern Bullfinch has been reignited, with a bird in Wells Woods, Norfolk. So I thought I post it and see what can be learned. I found the bird with 2 females on the coastal path. It certainly ticked the tame box. I was only digiscoping in those days, no DSLR. In photographing I tried to stand as far back as possible but was prevented by the narrow footpath and thick hedge. It was hard to get the whole bird properly on the picture.

It’s a male. A great big fat male and it was feeding on nettle seeds (of all things!)

You can see the cold pinkish tones in the underparts and cold rather pale greyish upperparts. The odd character was the greater covert bar.

White and broad but with the white bleeding  in thin lines up the outer edges of the feathers. The thin white ‘bleed’ gets longer on the inner greater coverts (partly obscured).

Looking into Northern Bullfinch identification I visited the Natural History Museum at Tring.

Very thin strings of white bleeding up the outer edges of the greater coverts is a character I only found on East Siberian birds (ssp. cassini). Certainly Scandinavian(Northern) Bullfinches regularly have a ‘saw-toothed’  upper edge to the greater covert bar. But on this bird, I would suggest its a little more than a ‘saw-toothed edge. Its a subtle difference. Hope you can see what I mean in the photos.

Photo of vagrant male cassini in Alaska here (scroll down):  http://www.surfbirds.com/Features/pdalaska01-2.html

Now I am not saying the Whitby male was ssp. cassiniThe sample size was too limited. However I have not convincingly found an example of  Northern Bullfinch amoung Scandinavian Bullfinch photos in subsequent years with such a wing pattern.  Maybe there were some more like this around in 2004. I have never had enough data to take it further but it has always left me intrigued (as some who have heard me give an evening talk on birds may have already heard). Where was it from really? Common sense might suggest not that far. With a Redpoll ringed in eastern China and controlled in Belgium though, I am not adverse to keeping options open!

Comments welcome

male Northern Bullfinch, above Robin Hood’s Bay, nr Whitby, October 2004. Trumpeting calls were heard from the little flock of 3 birds, though I can’t specifically say this male gave them. However his striking pattern of white on the greater coverts has always left me questioning his true origin.

I found this 1st winter female Northern Bullfinch at Flamborough in late October 2003. Nervously identified (on sight views), thankfully it ended up in Mike Pearson’s mist net and the ID was confirmed on wing length. Got me hooked on Northern Bullies.

1st winter male Northern Bullfinch. The Point, Spurn, 18th October 2010. Richard Willison.

I saw this one with its plump body and incredibly broad and grey wing bar– typical of some Scandinavian males. It also has a ‘saw-toothed’ edge to the upperside of the wingbar- slightly obscured but just discernible. Compare with the upper edge of white wingbar on the 2004  Whitby bird, which effectively bleeds white in a thin line along the outer edge of the feathers.

This 1st winter female ‘Northern’ at the Point, Spurn accompanied the 1st winter male (above) together with another female. 23rd October 2010. This also has a slight saw-toothed upper edge to the wing bar. No trumpeting calls were heard from this group.

 

Taiga Flycatchers in France

3 accepted French records and counting

An old friend. 1st winter Taiga Flycatcher, Tresta, Fetlar, Shetland. September 2009. Mike Weedon. Taken on the BIG Day (27th September 2009)- first proper views of the tell-tale uppertail coverts. The third for Britain. There have also been 3 records in France.

A Taiga Flycatcher was reported in Marseilles earlier this month. Sébastien Reeber summarises the accepted records:

Dear Martin,
There are three accepted records in France, all of these initially accepted as parva. Most French records of parva with photos have been re-examined.
These are as follows (all 1st winters) :
Ile de Sein (Finistère), 14 october 2000
Ile de Sein (Finistère), 28 september 2002
Camargue (Bouches-du-Rhône), 3 november 2002

The last two records were with pictures, but unfortunately, not of good quality !
You will find enclosed a paper published in Ornithos, in French with an English summary.
Best regards,
Sébastien

The French records:

French Taiga Flycatchers.pdf ORNITHOS



Hunt for the Thayer’s Gull

4th December 2010, London

OK maybe a grand title, but I am very much looking forward to the Gull Day at Rainham. With Dominic Mitchell of Birdwatch magazine we will be begin with a short introductory talk followed by a day of searching, learning and encountering. I’ll do my best to pass on anything I have learnt as well as the many mistakes I have made. The focus will be on discovery, on sharpening skills in ageing, on identifying and looking beyond the expected. With Caspian Gull, Yellow-legged Gulls (all ages) and Eastern Common Gull at least on the cards, never mind the chance (however small) of seeing the ‘Pitsea Thayer’s Gull’, it  should be lots of fun.

There are a couple of  places left, so let me know a.s.a.p.  if you would like to come, and not miss out!

Taking part: the Gull Master Class begins at 10 am and finishes at 4 pm. Cost: £40.  We will meet in the car park at Rainham Marshes RSPB reserve; warm winter clothing, rain gear and a packed lunch are essential

To book and for more information:

email: martin.go@virgin.net

phone: 077 899 82226

Bean Goose – Salton Sea, California

Definitely Eastern but which species?

This Bean Goose, a major Rarity in North American, has been present since around 10th November at Salton Sea, California. Julian Hough sent me a bunch of photos which proved irresistible…

The perplexing question  is whether it is a more northerly breeding – Eastern Tundra Bean Goose ssp. serrirostris, or an Eastern Taiga Bean Goose, better known as Middendorff’s Goosemiddendorffii‘ the latter being given full species status by some.

Great pictures, lots of information, but which is it?

Alsot have a look at this, highlighted by Paul leader in Surfbird forums:  http://www.hkbws.org.hk/BBS/redirect…tpost#lastpost

It seems to show the serendipitous comparison of 2 middendorffii and 2 serrirostris in one flock- amazingly the first records of Bean Goose for Hong Kong.

The following amazing set of photos taken by Ken Kurland (1st set) and Larry Sansone (2nd set). Thanks guys, makes ID challenge mush easier to at least attempt. Great job!

Tricky Middendorff’s type Bean Goose with Pacific White-fronted Goose, ssp. frontalis. Just to take a break from Bean Goose talk. I would love to find one of these Pacific White-fronts in Britain. I have seen them in N America. First views of a small flock, I thought they were White-front X Greylag hybrids or something – so big and unrefined looking were they!

All photo above of apparent Middendorff’s type Bean Goose (with Pacific White-fronted Goose), Salton sea, California. Ken Kurland. 16th November 2010.

MG’s ramblings

Please excuse a Brit commenting on a North American rarity! Julian Hough sent me some wonderful photos of the Californian Bean Goose by Ken Kurland and Larry Sansone which ‘drew me in’. I have found it to be a bit of a conundrum but have probably learnt more about the Eastern Bean Goose taxa than previous sorties into the subject. As well as my own ruminations I learnt much by chatting with Richard Millington, Dan Brown, Tristan Reid and Chris Batty who all have ‘previous’ with Bean Geese.

My personal summary of the identification issues:

While Middendorff’s Goose was quickly heralded for this bird, my search image was of birds with an exaggerated long bill and swan-like (or even Swan Gooose-like) head and neck profile. That’s the kind we would like to see and are looking for in the UK- and some of us are still disquieted by several birds in Shetland and Falkirk last winter which might have been middendorffii.

The Salton Sea bird did not seem to me to have that kind of long, exaggerated head/ bill profile, and my first reaction was to wonder about eastern Tundra- serrirostris. Following research and helpful discussion this is what I currently think about Salton Sea bird.

  • It’s a least 2nd Cal year or older. Most of the upperpart and flight feathers are new, fresh adult types. I see old (unmoulted) feathers in the small wing coverts and in the body plumage. They don’t look like juvenile feathers, but old versions of the new feathers. Our juvenile/1st winter grey geese usually have lots of obvious slimmer more U shaped buffy fringed feathers over the upperparts at this time of year. Pyle seems to indicate some retained unmoulted feathers are normal in these areas for adult White-fronted Goose in November – guess it’s OK for adult Beans to still have the same.
  • It’s a big Bean Goose. In body bulk it’s larger than accompanying frontalis White-fronted Geese. This is especially obvious in the flight photos. These Pacific White-fronts are larger than the Russian White-fronts (ssp. albifrons) which winter in Britain.
  • The bill at first glance doesn’t look that long- perhaps an impression affected by the very deep bill base and also by precise angle from photographer/ posture of bird etc. As others have said though in relation to head it generally appears about same length as head or just shy of it. Long-billed compared to shots of rossicus and serrirostris.
  • The bill is slightly concave in profile especially just above the orange patch, where it becomes quite narrow. Tundra Bean tends to remain straight or convex and lumpy without fineness near the bill tip.
  • The head colour intrigues me as in varying lights I still comes out as being rather pale, lacking the cold dark brown tones and the strong contrast with the lower neck of Bean Geese seen in Britain. On most Beans- when light factors are accounted for- the head and upper neck are dark coldish brown, contrasting obviously with paler lower neck and breast. Hypothetically this may be a good pro-Middendorff’s feature to be tested.
  • The contour of the bill and forehead is actually a continuous straight line right up above the eye. So even though the bill is thick-looking, there is actually a smooth rather Swan-like profile to the head and bill. Tundra Bean seemingly including serrirostris, have an obviously marked ‘forehead’; a more vertical rise at the bill base produces a lumpier, squarer head shape. The combination of the more Swan-like profile on a (warmer) paler head lacking contrast with neck seems ‘Middendorffish’!
  • The auxiliaries do appear to be genuinely darker than the slightly paler underwing coverts. A feature previously mentioned in print by Dan Brown as hypothetically useful for separating Middendorff’s. Worth remembering and following up.

So overall its bill length and profile, head and bill profile, head colour, body size and possibly  auxiliaries favour Middendorff’s. However it’s not an easy or classic bird- at least as I understand and am a little uneasy to say it robustly a straightforward Middendorff’s- at least without further information. These are my outstanding issues:

Question about ID as Middendorff’s

  • Neck length not entirely convincing. In such a major rarity one would hope for a ‘classic’ individual with long ropey Swan-like neck. In all the shots on the ground it doesn’t look particularly long-necked- perhaps one of Larry’s shot being an exception. However the same is repeated in flight where one would think a longer neck would really show up. See flight shots alone and with Pacific White-fronts. It looks decidedly unimpressive in the neck department for the perceived impression of how Middendorff’s should look- doesn’t it?.
  • I still wish the bill looked longer and thinner overall, especially at the ‘tip’ end.

The bill profile is  definitely slightly concave here especially just above the orange patch.

This is the one shot that the neck looks longer, more ropey and combined with head and bill is more convincingly ‘Taiga’ than ‘Tundra’.

Interestingly the auxiliary ‘fan’ does appear to be genuinely slightly darker than the underwing coverts. A useful feature for identifying Middendorff’s Goose?

Not especially (or sufficiently?) long necked looking at least I wish it looked longer -necked.

All photo above of apparent Middendorff’s type Bean Goose (with Pacific White-fronted Geese), Salton sea, California. Larry Sansone. 17th November 2010.

Thoughtful comments from Dan, Tristan and Richard, based on the photos here. Thanks guys!

From Dan Brown:

Martin,

Thanks for these – interesting bird. I always love a good ID challenge.

Well I agree with you in that it is certainly not a stonking great Middendorff’s, however I would not put it in the serrirostris/rossicus camp. The reasons for this are:

  • the bird is clearly very large and robust
  • The neck is relatively long but not as proportionally thickset as I would expect from a serri/ross.
  • The bill although not a stonker is still pretty long

On this basis I would put it in the fabalis/middendorffii group. Obviously Middendorff’s is significantly more likely to occur in western USA than fabalis Taiga. Features which favour Middendorff’s are:

  • The bill is still a reasonable size and more important robust with a deep base and a slightly concave culmen
  • The cutting edge is heavily curved with a comparatively deep lower mandible though definitely not as deep as on some Middendorff’s (see below)
  • There is a distinct lack of dark feathering around the bill base, typical on most fabalis unless they show white-front like pale feathering
  • The general plumage tones of the head and neck in particular are warm almost cinnamony, fabalis is normally a colder tone.
  • The axillaries appear dark and contrasting with the rest of the underwing colouration – this is something that may be useful in Middendorff’s ID but I’m not 100% sure on this yet.
  • In flight the head appears deep chinned and almost hangs, far more so than on a typical fabalis.

In conclusion I reckon that this is a Middendorff’s but on a cautious note though it may be foolish to right off what used to be known as johanseni. There is still plenty to be done on these eastern Beans and a few key winter trips and some nice shots would certainly be informative to all. There is clearly a lot of variation between birds and I suspect between different wintering areas although one thing that does seem consistent is the bill patterning among these eastern Bean Geese – interesting?

Some of these may be of use/interest but you are assuming that ID’s are correct:

A similar bird to the US one in terms of bill structure:

http://www.pbase.com/blomdahl/image/113680906

Oriental Bird Club  photo catalogue – scroll through for various images – I do NOT think that these are all correctly ID’d but it gives a useful indication of variation and complexity of ID’d birds correctly!

http://orientalbirdimages.org/search.php?p=1&Bird_ID=164&Bird_Family_ID=&pagesize=1

Good Middendorff’s:

http://www.birdingintaiwan.org/gallery/pen%20shing/gallery%202/Bean%20Goose1.jpg

Another Middendorff’s:

http://www.birdforum.net/opus/Image:31557bean-goose_8053.jpg

 

Another Middendorff’s but a similarly lighter-billed bird like the US one:

http://www.birdskorea.org/Birds/Birdnews/BK-BN-birdnews-2008-02.shtml

Middendorff’s:

http://plfoto.com/1498668/zdjecie.html

I suspect that if a Middendorff’s turned up in the UK that if it were with Taiga Beans it would stand out pretty well however the chances are quite high that it might arrive alone and therefore make direct comparison difficult.

Hope this helps a bit at least.

Cheers Dan

From Tristan Reid

Hi Martin,

Thanks for the images; what a beast (the frontalis Whitefront looks a stonker too)!

Firstly from a personal point of view the phrase ‘deep water and cannot swim’ would summarise how I feel about commenting on this bird 😉

However, that won’t stop me giving it a go!

As you suggest, this is a very large bird (certainly out sizing the frontalis White-fronted Goose that it is accompanying). To my eye the bill does appear very long (though I accept that some middendorffii can look longer). I cannot see this fitting into serrirostris particularly neatly; the structure of the bill seems wrong for this form. The bill seems to show the neater triangular shape (lacking the obvious bulbous/swollen base to the lower mandible that is shown in the Tundra group).

My feeling is that this bird is most likely a middendorffii; though I am not sure how confident I would be in ruling out fabalis/johanseni!

These links may be of use:

http://www.mangoverde.com/birdsound/spec/spec27-19.html

http://www.birdskorea.org/Gallery/Species/BK-GA-Anser-serrirostris.shtml

http://www.surfbirds.com/cgi-bin/gallery/search2.cgi?species=&photographer=&location=&county=Japan

Regards

Tris

(Tristan also though he could see differences in the sonograms between rossicus and fabalis such that further study into calls of other Bean Goose taxa may produce useful differences.)

From Richard Millington

Hi Martin

Leaving aside the issue of intergradation/hybridisation, the task seems to be to identify this adult vagrant as either a (long-billed) serrirostris or a (‘less-than-extreme’) middendorffii

In some of the latest photos, the bird in question does look thick-necked (thus relaxed, unlike the frontalis behind in one image, which is stretch-necked). Given that frontalis is larger and bigger-billed than our albifrons, the Bean is still a big bird by anyone’s standards, and might it be able to stretch its neck longer?

It does not look quite as huge, nor as ‘swan-necked’ as classic middendorffii, and obviously it could be said to look too short-necked in flight.

So is it serrirostris? Serrirostris has a longer, deeper bill than the rossicus we are used to seeing in Europe, and it is a bigger bird overall. Not all serrirostris have short fat bills; some may have longer bills.

Averaging the overall length of the bill of the USA bird (I know it varies depending on the proximal point of measurement) it ‘approximates’ to about the same length as the head (skull).

This is arguably too long for serrirostris (which seems to average only 3/4 the head length: ‘folded back’, serrirostris bill reaches to midway between the eye and nape, not all the way to the nape).

Okay, a decidedly dodgy rule of thumb, but it at least shows that this bird really does have a genuinely long bill…

Also, the culmen is straight like a Taiga, with little of the ‘bump and dish’ effect seen on Tundra birds.

Also, the line where the loral feathering meets the base of the upper mandible seems to cut forward above the gape before sweeping up and arcing back to where the culmen juts in close to the top of the eye. On the USA bird the culmen ridge juts deep and high into the pre-orbital area. Again, a very subjective thing, but from photos it seems that on serrirostris this feather/bill join is more upright, less of an arc and does not sweep back into the head so much at the top.

Also, I think the cutting edge of the upper mandible (upper edge of the grin patch) looks straight for most of its length, suddenly curving down near to the face (about midway between level with the nostril and the gape); this looks more like the bill structure of Taiga birds. On Tundra forms, a more pronounced curve of this cutting edge looks more evenly bowed along the length of the bill, with the main ‘bend’ of the curvature falling about level with below the nostril (i.e. midway along the bill rather than towards the rear).

The head looks quite long and square, and less ‘puffy’ or rounded than on many serrirostris, and flat-chinned (Tundras often show a ‘dropped jowel’ effect to the chin line)

My personal, vague, and rather Heath-Robinson assessment the shape and size of the bill, and the bill/head profile (from various photos, I must stress) steers me away from Tundra (serrirostris) but towards Taiga (middendorffii) Bean Goose.

However, it does look too short in the neck, especially in flight. Perhaps, after all, it is a hybrid…?

I freely admit that I may be wrong (I often am), if that helps

Cheers Richard

Waxwings -over the house

Bonanza!

Getting in the car just before 9 am this morning, 10 Waxwing flew over the house. I have seen them once here before though non have yet landed in the garden. With some 300 in the Sheffield area, it’s going to be a trilling winter.

Popped over to Herries Road where a flock of 30 were feeding among industrial  busyness and in the shadow of Sheffield Wednesday football ground, some might say they have style in choosing where to feed. Non yet report near the United ground then?

1st winter Waxwing, Herries Road Sheffield 19th November 2010

Thought I might try to get photos showing ad male/female and first winter of both in identifiable plumages. What’s this one? Well seems to be a first winter- no white curving round tip/inner web of primaries, and yellow outer fringe is white on the longer primaries. 4 ‘red waxy tips (which spawned the word ‘shocking pink’- allegedly) means I don’t know if its male of female as both can show this many. It’s quite bright in parts so my wild guess is it’s a male.

Expert Answers: Why the White in the Great White Redpoll

Albinism, Leucism and Vitiligo

Th posting on the Great White Redpoll has stimulated some fascinating and educational responses. No more so than that supplied by Hein van Grouw, Bird Group Curator at the Natural History Museum, Tring. Thanks Nils van Duivendijk for contacting  Hein, to Hein himself (see below) and all those whose responses are in the comments section below the first post. Worth a read.

 

“This Redpoll is indeed interesting but certainly not rare. There are many mutations which can cause a change in the plumage pigmentation and therefore an aberration in the colour. All kind of colour names are seemingly randomly used, now and in the past, to identify mutations in birds. Most commonly, and most often wrongly, applied is the name Albino or Partial Albino. This name is widely used for all sorts of different colour aberrations, but in only a few percent of the cases it is used correctly. Due to the mutation, an Albino is unable to produce melanin pigments at all. A mostly white bird which nevertheless shows some form of melanin pigmentation is never an Albino, by definition.

Therefore ‘Partial Albino’ does not exist and is a contradiction in terms.


This latter name is often used for what is in fact Leucism. Leucism, from the Greek Leukos = white, can be defined as the partial or total lack of pigments in feathers (and skin). The lack of pigment is due to the congenital and heritable absence of pigment cells from some or all of the skin areas where they are normally present and where they normally provide the growing feather with pigment. Depending on the sort of leucism the amount of white feathers can vary from only a few white feathers (= partial leucistic) to totally white individuals. The totally white individuals always have colourless skin as well. Partial leucistic birds can have normal-coloured bill and feet depending on where the colourless patches occur on the specimen.

However leucistic birds always have normal coloured eyes.


There are however other congenital causes for pigmentless feathers. Whereas leucism is visible after hatching, vitiligo (also called progressive greying), for example, is a progressive condition that arises after a certain age. Vitiligo is defined as the heritable progressive loss of pigment cells with age. From a certain age, when the progressive loss starts, the bird will get more white feathers after every moult. This is not uncommon in birds and it is known in Jackdaws and Blackbirds for example. And it seems it is not uncommon in Redpolls either as I have seen several identical specimens over the years.”

Hein van Grouw, Curator, Bird Group, Dept. of Zoology, The Natural History Museum, Tring.

Great White Redpoll in Sheffield

So that’s what it looked like!

Sheffield’s Great White Redpoll. The second record this year.

Some of Sheffield bird ringers (SORBY Breck) caught a fascinating Redpoll yesterday. Geoff Mawson and David Williams sent photos through. It’s a corker.

Now here’s the weird thing. I took one look at the pictures and immediately thought of last winters bird. December 2009 and January 2010, a ‘white’ redpoll possibly Arctic was very  poorly seen at 70 Acre Hill. Eventually I managed some reasonable views. It was clearly stunning looking with lots of white, but more semi-albino than Arctic, but what a redpoll! It looked  just like the bird in these photos.

Remarkable thing is the bird in these photos had a ring on yesterday. So it was a ‘control’. It was rung last year as a normal looking first winter! Presumably something in the local gene pool means that its first adult moult produced these amazing white feathering- and there are more from the same gene pool.

Never heard of that before, a bird ‘moulting into albinism (or leucism).

All photos of ‘white’ Lesser Redpoll, trapped 70 Acre Hill Sheffield, 14th November 2010. Geoff Mawson.