There are two clues to it being a juvenile-first the vertical blotches on the breast ( horizontal lines in an adult), and second the bright yellow iris which becomes orange in adults. We determine the sex of Sparrowhawks--like most birds of prey, on size--generally males are significantly smaller than females.
Thermal imaging sessions have been very successful--even in conditions of bright moonlight when we wouldn't normally try. However there have been a series of evenings with no moonlight recently and catches have been good as a result. One evening in particular saw us break our own record in catching 40 new Skylarks in a couple of hours. To put this in context until recently when a few of us started
using thermal imagers to help catch Skylarks, there were only around 200 caught in the whole of the UK every year!!One of the most surprising catches however, was in a well grown crop of something where we felt we wouldn't see anything....We did see a bird, caught it and found it was this little beauty......
This is a most unexpected juvenile male Stonechat. A cracking little bird and certainly the first we have caught like this--and we'd be very surprised if anyone else has caught one of these using a thermal imager.
We are hoping to catch more Skylarks and Starlings this week--and we hope a rather pretty finch --more news on all of these later.
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