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| 1 | 2 | 3 |  » Stats |
Members: 48,648
Threads: 78,878
Posts: 821,283
Top Poster: glsammy (14,777)
| | Welcome to our newest member, Kellyn | |  | 
22-02-2009, 11:22 PM
|  | Moderator | | Join Date: Apr 2007 Location: Belvedere, Kent
Posts: 9,560
| | | Strange line in a duck's eye
Any one know what this is? I took two photos of a shoveler one second apart yesterday. In the first the eye looks normal and in the second there is a diagonal brown line across the iris...  
I took 30 or 40 other shots but in all of them the eye looks normal. Hope that someone knows enough bird anatomy to explain this.
Dave P.
(P.s. did you know that you can sing "eye of the shoveler" to the tune of Survivor's Eye of the Tiger? Well you do now!)
__________________
(a.k.a. "Horizontal Dave")
"A good man is hard to find, especially if he's hiding. In a field. With combat fatigues and a false beard." - Wilson Dixon |
22-02-2009, 11:27 PM
| | Commander of the Wild Empire | | Join Date: Oct 2008 Location: Derbyshire
Posts: 1,039
| | | re: Strange line in a duck's eye
Hi Dave, do you think it could be a reflection? I notice in the second shot that the light refection is also different. Just a thought, but it does look the same colour as the pupil.  |
22-02-2009, 11:41 PM
|  | Commander of the Wild Empire | | Join Date: Oct 2006 Location: N.E. Derbyshire
Posts: 2,044
| | | re: Strange line in a duck's eye
Hi,
ducks have a protective transparent membrane that closes over the eye when the head is under water and I'm guessing that your shot has caught this half closed ( or half open  ) over thew eye.
neil |
23-02-2009, 08:44 AM
|  | Commander of the Wild Empire | | Join Date: Oct 2005 Location: N.Cheshire
Posts: 1,389
| | | re: Strange line in a duck's eye
Super images Dave! 
I haven't a clue about the eye line but will be singing that song all day now!!!  |
06-03-2009, 07:03 PM
| | Moderator | | Join Date: Apr 2007 Location: Belvedere, Kent
Posts: 9,560
| | | Re: Strange line in a duck's eye
Quote:
Originally Posted by wildlifesnapper  Hi,
ducks have a protective transparent membrane that closes over the eye when the head is under water and I'm guessing that your shot has caught this half closed ( or half open ) over thew eye.
neil | That sounds liek the explanation Neil, many thanks!
Dave P.
__________________
(a.k.a. "Horizontal Dave")
"A good man is hard to find, especially if he's hiding. In a field. With combat fatigues and a false beard." - Wilson Dixon |
06-03-2009, 07:56 PM
|  | Active Member | | Join Date: Feb 2009
Posts: 69
| | | Re: Strange line in a duck's eye
In humans you can get a defect in this iris like this called a Coloboma. It could be this but the other suggestions seem equally feasible. |
06-03-2009, 07:58 PM
| | Active Member | | Join Date: Feb 2009
Posts: 69
| | | Re: Strange line in a duck's eye
Sorry didn't read your post properly! If it wasn't there a second before it must be the membrane thingey. |
06-03-2009, 08:01 PM
|  | Officer of the Wild Empire | | Join Date: Jul 2007 Location: Hull
Posts: 716
| | | Re: Strange line in a duck's eye
I think is not only ducks, all birds have a 'third eyelid' that closes horizontally and is semitransparent, so it keeps some visibility, its called nictitaning membrane.
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