Monday, 4 October 2010

Latest from Mick P at Bestwood

A good session this morning resulting in a couple of interesting birds. A total of seven Bullfinches (2 ads, 5 juvs) were caught including this male, easily aged as a 3JP!

Also a Treecreeper which I aged as a juvenile because of the prominent pale tips on the outer webs of the outermost primary coverts. An explanation of this can be found by on Sorby Breck`s excellent blog, dated the 24/1/2010, http://www.britishringers.co.uk/blog/#January%202010 where they make reference to "Ageing and Sexing in the European Treecreeper" by Suorsa and Hakkarainen. This study also mentions a contrast in the colour of the alula feathers in juveniles. I didn't detect this in the hand and I don't think the photos are conclusive either.
 
Other birds included - Linnet, Goldfinch, Robin, Dunnock, Great & Blue Tits, Blackbird, Song Thrush and Chiffchaff.
Mick P

No comments:

Post a Comment