Age codes – poll
13th January, 2021 | Ringing
Dear visitors of this website,
purpose of this website is to share my photos with you. One of the aims is also to serve as a reference for you when you are ageing species you encounter in the field. Therefore, I would like to make the age codes used in the gallery as clear to you as possible.
I am using a hybrid system here. I use a coding based on calendar system used here in Czech Republic with an appropriate euring code. The euring code should be self-explanatory by itself but I found out that some people are not exactly familiar with it. Also, stating that age of some bird is e.g., 2Y (euring: 5) might imply that the bird is actually two years old when in reality it didn’t probably celebrate its first birthday, yet. Maybe adding a C for “calendar” in there and making it 2CY would therefore made things a bit clearer..?
Anyway, quite recently, I was warned that when I want to describe, let’s say, an “adult” Common Chaffinch (i.e. one which is at least one year old, see the example bird below) in spring, I might be actually confusing quite a few ringers from quite a few European countries. At this website, such birds are labelled 2Y+ (euring: 6). But in Sweden (and some other countries) such bird would be called 3Y+, or 3CY+ (see here ).
So, the question is. What would be the most logical and straightforward way to call such bird for you? Let’s say you trap a Common Chaffinch (Fringilla coelebs) in spring and it is clearly an “adult” bird, i.e. there are no juvenile flight feathers, tail feathers, coverts etc., whole plumage is post-juvenile (euring 6). I am attaching an example bird below. Please let me know in the poll, what would you prefer (choose one option only) and if you would like to, you can add a commentary, too. I will analyze the results and try to update my gallery accordingly. Many thanks for your help!
The poll has ended. Thank you very much for your participation. Results are available here: poll results.
 This misunderstanding is also quite often the reason why some people seem to almost hate calendar system in my opinion.
 Please, this is not an ageing exercise. Forget about some juvenile moulting completely and other irregularities. I am trying to make the gallery more user-friendly by this poll, not to discuss about moult this time, thank you very much for your understanding.