Birds Lose Colour Vision in Twilight

To: Birding Aus <>
Subject: Birds Lose Colour Vision in Twilight
From: L&L Knight <>
Date: Wed, 18 Nov 2009 20:05:23 +1000

ScienceDaily (Nov. 16, 2009) — Research at the Lund University Vision Group can now show that the color vision of birds stops working
considerably earlier in the course of the day than was previously
believed, in fact, in the twilight. Birds need between 5 and 20 times as much light as humans to see colors.


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