With kind permission of a landowner we've had a few attempts in LYC and caught 4 birds along with a host of other bits and bobs. The Hawfinches staying nearby with or without a net up. Here's a few recent pictures:
5 female above compared with 6 male below (next 2 pics: Pete Wood). See the shape and gloss on seconds and tertials.
Full adults have square tipped tail feathers- pic to follow. See that gloss in the wing again. Those eagle-eyed might spot traces of blood on the fingers- an occupational hazard for ringers putting fingers too close to a bill as shown below. They're big! When cherry and yew stones are usually on the palette, a finger doesn't really stand a chance!
See the difference in the tail feathers to the female above. Much squarer ended on these two males caught at the same time.
Check out the BTO Cymru blog for more on Hawfinches ringed in Wales plus the 2 Norwegian controls: http://btocymru.blogspot.co.uk/2011/07/norweigian-hawfinch.html
5 female from Sat April 5.