Regular readers will know that we have been catching quite a lot of this species due to a combination of a great site for the species plus the development of using the thermal imager to find them especially during the day.
When I responded I did so in writing which is often not too helpful--but by a weird co-incidence ( I had a message telling me I had too many photos on my phone)--when clearing out my photos on my phone I came across some pictures we took to illustrate some of the key points. I'm in the process of posting these on Facebook--but thought I would also put them on here for readers to see--and for our trainees to refer to.
The conventional guide is not terribly helpful--and it has led to the majority of Jack Snipe ringed in recent years, being aged as adults. It's unlikely that this is the case, so we started looking for other clues based on a guide produced by a Spanish ringer called Xavier Blasco. He and we tend to look at 4 features which I hope show pretty well in the following pictures:-
1) HEAD STRIPES
The bird on the right shows two adult features on the head--the colours of both the light and dark stripes are deeper, and the stripes are more clear-cut and less diffuse than those on the juvenile bird on the left. ( Bear in mind the leg colour of the adult bird too)
2) BACK STRIPES
The well known stripes on the back of Jack Snipe are more golden coloured in the adult bottom bird) than the paler ones on the juvenile
3) LEG COLOUR
Although this doesn't show the legs of both birds--those of the adult are clearly a blue colour--check back to the first picture--juvenile legs are predominantly green
4) OUTER PRIMARY SHAPE
The breadth of the outer primary and shape of the tip is also useful. The right hand bird is an adult with broader rounder tipped outer primary. You can just about make out the green legs on the juvenile.
We knew that the adult in these pictures was an adult because it was a bird which we had originally ringed just over a year before these pictures were taken
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