pupil dilation in Red Wattlebird

To: canberrabirds chatline <>
Subject: pupil dilation in Red Wattlebird
From: Con Boekel <>
Date: Thu, 21 Nov 2019 04:18:24 +0000
I noticed that one of the Red Wattlebird images I took this morning was
of a bird with a contracted pupil. It was early morning and the bird was
side on to the sun which was still fairly low above the horizon (Note
highlight on the eye). The second image is of a Red Wattlebird taken on
a much darker day.

One article I flicked past on the web reported pupil sizes in birds
contracting to 30% compared with 15% in cats.




Description: _P3A5094 a large pupil.jpg


Description: 0U7A0202 a pupil dilation.jpg

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