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Subject: Hawfinch [Print This Page]

Author: wleepoin Time: 9/03/2011 21:14 Subject: Hawfinch

Yuen Long
5th March, 2011

Cheers
PWMK

Author: cgeoff Time: 9/03/2011 21:34

Very good photos. There are some even better shots of this individual at Owen's website (www.i-owen.com) that indicate this bird has bill damage at the base of the upper mandible on the right hand side. It is visible in this photo, but is more easily seen in Owen's shots. The type of damage present is strongly suggestive of this bird being of non-natural origin (i.e. having at one stage been in captivity).

GeoffC

Author: 深藍-Owen Time: 9/03/2011 21:47

wow geoff.. dunno u will step by my website. here's my photos then people don't need to search around :

March 5, 2011. Yuen Long Park.

Author: lyatming Time: 10/03/2011 00:01

Hi Cgeoff

For your reference:

BTW, thx Peter and Michelle on that day.

[ Last edited by lyatming at 10/03/2011 00:05 ]

Author: wleepoin Time: 10/03/2011 00:12

The moral of the story is ..... tight cropping does matter !

Cheers
PWMK

Author: cgeoff Time: 10/03/2011 10:10

Of course I do Owen. Some great photos there! The third of your shots shows well the damage.

Similar damage was shown by the bird at Airfield Road in early 2009.

The moral of the story is that we need to look extremely carefully at some birds. So, in terms of photographs, size does matter !

GeoffC

Author: Stonechat Time: 10/03/2011 21:11

I have found one today (10/3/2011), but it doesn't show the same characteristic on the bill. I wonder whether it is the same bird. Pls help to check.

[ Last edited by Stonechat at 10/03/2011 21:20 ]

Image Attachment: Hawfinch A.jpg (10/03/2011 21:11, 125.81 KB) / Download count 411
http://hkbws.org.hk/BBS/attachment.php?aid=8466

Image Attachment: Hawfinch B.jpg (10/03/2011 21:12, 116.46 KB) / Download count 429
http://hkbws.org.hk/BBS/attachment.php?aid=8467

Image Attachment: Hawfinch C.jpg (10/03/2011 21:13, 130.97 KB) / Download count 433
http://hkbws.org.hk/BBS/attachment.php?aid=8468

Image Attachment: Hawfinch D.jpg (10/03/2011 21:20, 136.34 KB) / Download count 470
http://hkbws.org.hk/BBS/attachment.php?aid=8469

Author: subbuteo Time: 10/03/2011 23:11

It looks like there is the same mark on the lower mandible of this bird as the bird in other photos?
Dylan

Author: Stonechat Time: 10/03/2011 23:25

Quote:

Original posted by subbuteo at 10/03/2011 23:11
It looks like there is the same mark on the lower mandible of this bird as the bird in other photos?
Dylan

Really...can't figure it out.

Author: tmichael Time: 10/03/2011 23:28

Several of the birds on the OBI database show the same feature.

Mike Turnbull

Author: brendank Time: 10/03/2011 23:48

Agree, a number of the Hawfinches (most of which were photographed in Russia) seem to have a similar pattern of "scraping" on the upper mandible.

Does anyone have a sense of whether Hawfinch is a more common or more uncommon species in the bird markets?

Author: lpaul Time: 11/03/2011 07:27

Quote:

Original posted by tmichael at 10/03/2011 23:28
Several of the birds on the OBI database show the same feature.

Mike Turnbull

Can you refer to specific photographs. There is also some damage to the feathering at the base of the bill on one of the Yuen Long birds.

Author: cgeoff Time: 11/03/2011 09:20

I must confess, I can't see that any of the birds on OBI definitely has the same bill 'scratches'. One of the photos from Japan shows a bird with marks in that area, but it's not entirely clear what's going on. Mike: pls specify which photos.

My observations of bird-trapping in China suggest that Hawfinch is frequently caught, although largely as by-catch. Other, brighter target species such as rosefinches and siskins come down to seeds laid out as bait, as do Hawfinches.

I agree, it seems unlikely that Hawfinches are attractive as a cage-bird, but I would imagine that there is very little selection carried out before birds are shipped to HK. I wouldn't be surprised if cages of birds are sent here, and then the selection is made in a rather brutal fashion. In otherwords, the sick birds are disposed of (thus no H5N1 cases in the market itself, though plenty in the immediate area!) and unattractive species (either from the point of view of appearance or song) are set free. Hawfinches would come into this category. This may be why we see birds in HK with signs of cage damage (or so it seems), yet few appear in the markets. I checked the Mong Kok market soon after the Hawfinches first appeared, but none were present.

Hawfinch is a real problem species for the RC. It seems very clear that some birds are ex-captive, based on their behaviour, the date of occurrence or plumage or bare part anomalies. Yet, some birds are apparently of natural occurrence, lacking any issues in these areas. The problem is, when a substantial proportion of records comprise the former, how can we assume the latter are OK?

The RC recently discussed this at a meeting (which will be reported on soon), and the majority felt no change was needed. However, we are always open to hearing other arguments, so please post them here if you have a view.

Regards,

GeoffC

[ Last edited by cgeoff at 11/03/2011 11:54 ]

Author: brendank Time: 11/03/2011 09:38

This picture isn't very clear but it does seem to have some scratching on the upper mandible.

http://orientalbirdimages.org/bi ... amp;Bird_Family_ID=

Author: cwchan Time: 11/03/2011 09:43

I attach here the photo which was taken on 28 February 2011 for reference. I think it is the same individual of Owen's.

Digiscopic shot, 30X eyepiece, Nikon 8400

100% portion cropping of above.

Author: 深藍-Owen Time: 12/03/2011 00:04

attached a tighter crop photo hope to show a bit clear of that scratch.

Author: Stonechat Time: 12/03/2011 00:34

A tighter crop photo of mine. If it is the same bird, the demaged part is found become more serious.

[ Last edited by Stonechat at 12/03/2011 00:37 ]

Image Attachment: Hawfinch bill.jpg (12/03/2011 00:34, 67.53 KB) / Download count 420
http://hkbws.org.hk/BBS/attachment.php?aid=8479

Author: cgeoff Time: 12/03/2011 11:35

These are different birds, as the pattern of damage on the bill is slightly different, as is the loral pattern.

GeoffC

Author: cgeoff Time: 12/03/2011 13:22

I have just re-read the description of bird-trapping activities and markets at Beidaihe and Qinhuangdao, Hebei, contained in the Cambridge Ornithological Expedition to China in 1985, of which I was a member. Among the main target species were Brambling, Oriental Greenfinch, Eurasian Siskin and Common Rosefinch.

Of most interest was the finding that Black-tailed and Japanese Hawfinches were the preferred species, especially the latter. Both species sing well, but the latter is apparently valued for its ability to learn tricks, such as flying to take seed from the captor's hand. There was no doubt that Hawfinches were the least favoured species, often simply killed if caught. However, I'm sure some must end up in the bird markets in south China, including HK.

Another favoured species was Mongolian Lark, which could command a price of Y150 per bird, a very large sum of money in the China of 25 years ago!

GeoffC

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