I need help with ageing of nestling Eleonora's Falcons (Falco eleonorae) based upon close up photos. Unfortunately I don't have biometric measurements. I would be happy if someone has a reference to books or articles with photos of nestlings at different ages. Or if someone is familiar with the Eleonora's Falcons I could send the photos by email.
Unfortunately nothing with Eleonora's, but with peregrines, in case. I don't know how different is the development time, but I could provide you several series of day-to-day pictures of wild peregrines chicks.
Dear Ronny, as far as I know there is nothing published with Eleonora's falcons. Maybe there is some unpublished work in Greece (Wink, Ristow, etc.). I would contact them about ithis issue.
Thanks for answers. I have filmed at the nests to look at diel activity and prey deliveries. And I only need approximate age of the nestlings at the day of filming.
To Carlo: Will it be okay that I send you my pictures? It is only 4 nests with 2 nestlings each.
To Pascual: Thank you so much for asking your colleagues if there is some unpublished work in Greece.
Dear Ronny, yes, no problem, just send them to me.
However, as said I can try to age them according to the development of peregrines that I know pretty well. I checked on my books, it seems these two species have an almost identical period from hatch to fledge, so it should be relatively reliable!
greetings
Carlo
Dear Ronny,
You can send the photos to me also, maybe our specialists can help, if you need a second oppinion :)
Greetings,
Attila
My opinion:
nest 2 right 10-12 days first calami appearing, not anymore a nice fluffy look
nest 2 left 17-20 days first tail feathers opening from the calami
nest 3 right 20-22 days tail feathers opening well from the calami, slightly more than nest 2 left image.
nest 3 left 26-28 days new feathers on the head and first feathers appearing in the body
nest 4 around 22-24 days
nest 1 right around 30-32 days a lot of new feathers on the whole body, but still traces of the downy feathers
nest 1 left 35-37 days Almost complete new feathers, almost ready for leaving..
can anybody confirm?
greetings
Try contacting Hartmut S. Walter @ UCLA (Emeritus, also on LinkedIn) to see if he can confirm Dr. Catoni's estimates.
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