|Milwaukee, WI. 02 December 2012.|
|Lake County, IL. 16 December 2012.|
I do feel, however, that we should continue ageing 1st, 2nd and 3rd cycle birds as such since we know so much more about what each generation of those feathers should look like, for the most part. I am tentatively choosing to label birds with marked tails, tertials and sub-adult like bills "3rd cycles". I will be happy to adjust the usage of this term if anyone can provide me with a 4th cycle+ example of a bird showing these features. Although there may be some guess-work involved here as well, it's a convenient system that we as field observers must have in order to communicate.