Bird news from across North Wales and beyond
Rob - you'll have to explain all this numbers lark- don't quote get it. Presume 7 is an adult?
MarcAny odd number is a bird where yo uknow the exact year it was born. e.g 3, current year, 5 last year, 7 year before last. Any even number is for a bird you know the minimum age. 2 is a bird that could have been born this year and applies in late autumn to birds such as Long-tailed Tit and House Sparrow that undergo a complete post juvenile moult so are indistinguishable from adults. 4 is definitely born before this calender year. 6 is definitely born before last calender year etc.For example a 3 Blue Tit would be one fledged this year. The year code will change on 1st January and it will become a 5 i.e definitely born the previous year. All '2's' will become '4's' i.e definitley born before the current calender year.All young Willow Warblers undertake a complete moult in their wintering grounds so can't be identified to spcific year so when we start catching them in a few weeks they'll be '4's'. Some Chiffchaffs cn be identified so most will be '4's' but we may get some '5's'. Make sense?
Aha! Thanks Phil - I think I get it now.
Forgot to say '1' refers to pullus (young birds in nest or only just fledged and unable to fly properly or wader chicks).
Thanks for that Phil.That was very helpful.
Since been aged as a 5 due to two generations in the secondaries (see the 2 different brown tones).Rob