There was no sign of 'the' Fieldfare in the garden this morning but, with temperatures rising slightly and birds feeding well in the garden, I decided I would open up a mistnet to see if I could catch and ring any of the tits and finches visiting the feeders. The wind was stronger than I'd anticipated, though, with the birds flying over or around the billowing net and within half an hour I'd closed the net again. A short while later, 'the' Fieldfare was back feeding on apples. I took a couple of snaps but didn't take much notice of it.
With the wind dropping, I opened up the net again. Not a lot happened until the Robin (the without inverted commas this time - this bird has been around in the garden since at least October) flew into the net; walking out of the door to take the Robin out of the net, I inadvertently flushed the Fieldfare into the net. Taking it out of the net I noticed something wasn't quite right - it had pointed tail feathers and a moult limit in the greater coverts... Hmm. That meant either I'd aged yesterday's bird incorrectly (quite likely, on the scale of things) or 'the' Fieldfare was more than one.
Comparing pictures of this afternoon's bird with the bird yesterday, it clearly is a different bird. As well as the moult limit in the greater coverts, the mantle is less red-brown and lacking the dark feather centres, and the crown feathers seem less boldly streaked.
Here's today's bird avoiding my net:

So, what of today's bird? Well, as mentioned, it's a first-winter with 5 juvenile greater coverts, but what about the sex? Looking at the crown feathers and comparing with the figure in Svensson, I'd be tempted to err towards it being female. And, indeed, the mantle - lacking blackish feather centres - seems to suggest that too; the wing length (144 mm) lies at the bottom end for a male but somewhere in the middle for a female. The tail looked rather blackish and perhaps suggested a male. I think, all things considered, I would feel most comfortable leaving this bird as "sex unknown" until I know a little bit more about Fieldfares. Better to have no data than wrong data, and all of that...

Whilst releasing the bird, a second Fieldfare was
chacking away from a garden down the road, so there are at least two birds around. It will be interesting to see which birds visit the garden again.
And finally, it was nice to see 'our' Robin was doing well for its little self. It had plenty of fat and weighed 24 g - a whole 5 g heavier than when it was first ringed in October.