spotlighting and bird's eyes - birding-aus

Message from discussion spotlighting and bird's eyes

Steve

More options May 10 2008, 3:04 am

From: "Steve" <smur...@uqconnect.net>

Date: Sat, 10 May 2008 17:04:20 +1000

Local: Sat, May 10 2008 3:04 am

Subject: RE: [Birding-Aus] spotlighting and bird's eyes

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Ashwin....This subject was discussed last year on birding-aus. Someone (I
can't remember who) reproduced a discussion of this very question by
Professor Jack Pettigrew from University of Queensland who has studied the
physiology of bird vision. If I recall, the bottom line was that birds are
able to withstand the effects of bright light much better than we are, but I
suggest you check the archives and read his enlightened comments for
yourself.
Steve Murray

-----Original Message-----
From: birding-aus-boun...@vicnet.net.au

[mailto:birding-aus-boun...@vicnet.net.au] On Behalf Of Ashwin Rudder
Sent: Saturday, 10 May 2008 11:38 AM
To: birding-...@vicnet.net.au
Subject: [Birding-Aus] spotlighting and bird's eyes

g'day

i was spotlighting some White-throated Nightjars last October, when i began
to wonder what the bright beams of spotlights actually do to nightbirds, and
just bird in genral, eyes.
when humans look into a bright light for too long, they suffer permanent or
temporary eyesight damage. I was wondering if this is the same for night
birds?
also, is there a difference in damage between different bulbs, eg LED,
Xenon, Krypton, etc?
Which is easier for spotlighting and identification, as well?

Thanks in advance,

Ashwin
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