Category: Thrushes#

Following the age and sex analysis (or ‘speculation’ may now be a more apt term) of last week’s Newnham Hill Ring Ouzels, I received some excellent images from Bob Bullock of one of the two females. This was the first of the two to be found, on 29th April – the one without the heavily-marked throat.

Although photos can be deceptive, the first of the three images, below, depicts a dark-looking individual, which appears to show a moult limit in the greater coverts of the left wing, i.e. the outer coverts have broad pale (juvenile) edges and the inners appear to be new, adult-type feathers. Ageing from this image in isolation would put the bird into the first-summer court. The general darkness of the plumage and the relative prominence of the whitish bib, ending in a point at the sides, would suggest a male.

However, the second image, of the other side of the bird, appears to show some uniformity across the greater coverts, the bird appears slightly browner and this would point to adult female – so that’s a puzzle.

Head-on, the third image highlights the bib, which is really rather dull and contains plenty of dark scales – probably more than would be expected in a first-summer male. So, still likely to be a female, then and probably adult as the bib looks to be adult in its extent and prominence.

Tricky stuff – comments welcomed! Many thanks to Bob for his fine images.

The discovery by Chris Coe, yesterday, of a Ring Ouzel at Newnham Hill, a locality which has, in recent years, established itself as a regular spring stop-off site for this species, sparked some debate about its age and sex.

It was still present this morning and Dave Warner located another one accompanying it, both birds remaining until at least late afternoon. While frequently retiring to the cover of one of the hill’s many hedgerows, both could often be seen feeding out on the open grassy slopes.

The news went out initially as a female being present on the hill but images released later suggested to some, at least, that it was a male, due to the extent of the white bib and the general ‘darkness’ of the plumage.

Ring Ouzel sexing is oversimplified by many publications, which suggest that the difference between the sexes is as stark as it is in Blackbirds, i.e. the male is jet black and the female is brown. In reality, it is not that simple and the difference in the ground colours between the sexes is far less marked than it is in Blackbirds. This was highlighted by Shirihai & Svensson in their publication Handbook of Western Palearctic Birds, which also includes many useful photographs to illustrate the point.

In truth, male Ring Ouzels are never as ‘black’ as male Blackbirds and females are often very dark brown and can even appear almost blackish in the field. In some instances, females can be almost indistinguishable from males and when you throw first-summer birds into the mix, then things become more complicated, with first-summer males often closely resembling adult females to the point of being almost indistinguishable.

Typical adult males normally look obviously black and will have a striking, contrasting, ‘clean’ white bib, which ends in a point at each side. Adult females can ‘appear’ really quite blackish and can have the same extent of bib but it is not usually gleaming white, being sullied with brownish scales and/or with smudgy brownish bleeding into it from the breast, to some degree. The sides of the bib do not end in a point and they are rounded or even square-ended. First-summers of both sexes, if seen well or in the hand, should show a moult limit in the greater coverts, i.e. the unmoulted outer few have broad (depending on wear) pale fringes, compared to the inners, which are more narrowly-fringed or largely plain. Adults have the same narrow fringes across the greater coverts, with the difference not so marked as it is in first-summers.

The Newnham Hill birds are both adult females. When seen well, their plumage is dark brown, not black, their bibs are ‘dirty’ and do not end in sharp points at the sides and the greater covert fringes are all of even width.

I was lucky to catch up with them both today and pleased to be able to watch them in such a nice setting. With its far vistas, plentiful cover and easily observable open areas, Newnham Hill would appear to offer more to the birder than nearby Borough Hill, which has become more popular with the general public and now suffers massively from human disturbance.