Challenging IDs

There’s a really interesting letter in the current issue of British Birds (Vol. 103), concerning the identification of Willow Tit and Marsh Tit. To sum up, Dr JTR Sharrock and Barry Nightingale respond to a recent paper by Richard Broughton, and say that they feel he may have been too pessimistic. They add: “Positive field identification of these two species may be challenging, but it is – in our view – easier than that of, say, silent Common Chiffchaff and Willow Warbler”.

Now, I was thinking about separating the two when I was at Willington GP on Sunday, and I’d tend to agree with what they say. One thing that tends to get underplayed, in our experience, is the structure of the two birds – Willow Tits always look very bull-necked to us, and that seems to be a more reliable ID factor than any of the others (pale wing panel, shape of bib, glossy or non-glossy cap). The letter writers, to be fair, point out that the important thing is taking into account a whole combination of factors, and we'd agree.

But we'd like to know - would you find separating Willow and Marsh Tit easier than separating silent Chiffchaff and Willow Warbler, as they suggest? And are there any other match-ups that you find even harder?