tag:blogger.com,1999:blog-8366015065945733687.post5924284962717728716..comments2023-12-20T08:34:04.161+00:00Comments on Ruffled Feathers: The nights are drawing outTony Crosshttp://www.blogger.com/profile/15223532534431871428noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-8366015065945733687.post-68485315402313417842016-09-12T21:47:34.692+00:002016-09-12T21:47:34.692+00:00Hi Václav,
I think there are definitely some juve...Hi Václav,<br /><br />I think there are definitely some juvenile males where you can see the suggestion of spots on the tail and outer primaries. They are brownish in colour, smaller and more indistinct than those in adult females. In the very few cases where I have noted the presence of such spots and tentatively sexed them as males and then re-trapped them in a subsequent season it does seem reliable.<br /><br />The genetic work mentioned above should provide the reliable sexing of a good number of juveniles. This DNA sexing, linked to photos taken at ringing, could well show how reliable sexing juvenile Nightjars might be. I will try to find a couple of photos of a juvenile male and email them over. Tony Crosshttps://www.blogger.com/profile/15223532534431871428noreply@blogger.comtag:blogger.com,1999:blog-8366015065945733687.post-88288881924805505182016-09-12T16:39:55.938+00:002016-09-12T16:39:55.938+00:00Hello, I would like to ask whether it is possible ...Hello, I would like to ask whether it is possible to correctly sex first-year nightjars. During these days dozens of migrating nightjars was caught by Czech ringers (I tried yesterday, but was unseccessful) and the growing number of caught birds arised a discussion about this topic. There are no nightjar experts in Czech republic, so if you'd be so kind and give me some advice I would be very glad. My email: vasekjelinek@gmail.com. Thank you. Václav Jelínek Anonymoushttps://www.blogger.com/profile/15172405289294705486noreply@blogger.com