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Jim Wright
 Post subject: Size of goldfinches
PostPosted: Wed Mar 01, 2017 9:13 pm 
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Joined: Fri Apr 11, 2014 9:39 pm
Posts: 394
Location: Cleethorpes
Is there any evidence that the goldfinches of today are chunkier than their counterparts of, say, a couple of decades ago?

Maybe I'm imagining it but they don't seem to be as diminutive and lightweight as I remember them from yesteryear.
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Stuart Britton
 Post subject: Re: Size of goldfinches
PostPosted: Thu Mar 02, 2017 10:01 pm 
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Joined: Wed Dec 29, 2004 6:44 pm
Posts: 1611
Location: Market Rasen
On February 28th I ringed 37 Goldfinches at a garden feeding site near Osgodby. 22 were males and 15 were females. The largest male had a wing length of 84mm and a weight of 18.3g ( which is exceptional) and the smallest female (they are sexually dimorphic) had a wing length of 76mm and weighed 14.0g. With such a spread it would be difficult to say whether they are larger than 20 years ago and my gut feeling says "no".
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Jim Wright
 Post subject: Re: Size of goldfinches
PostPosted: Sun Mar 05, 2017 2:19 pm 
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Joined: Fri Apr 11, 2014 9:39 pm
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Location: Cleethorpes
Thanks for the info, Stuart - appreciated.

Jim
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