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Freddy Johnson
PostPosted: Sun Dec 09, 2012 11:28 am 
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Joined: Mon Jun 05, 2006 11:54 am
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Location: Bracebridge Heath LINCOLN
Graham,

Further to your most recent Waxwing post above (on page 1), what is your estimate of the percentage of adults to first winters in the "at least 400" Waxwings you recorded yesterday (Sat) at Burton and the "additional 49" at Alkborough?

Freddy
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Graham Catley
PostPosted: Mon Dec 10, 2012 10:02 am 
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Joined: Tue Dec 28, 2004 11:20 pm
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Freddy

analysis of my photos and just watching the birds coming to drink, often the best way to check big flocks for colour ringed birds, suggests a ratio of about 20% - 25% adults but clearly the %s vary in the different groups though there is clearly a preponderance of first-winter birds in all the flocks I have seen. In smaller flocks it should be easier to check the proportions of adults to first-winters.
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