I'm not sure that there's a years-birding requirement
in regard to warbler ID.

Female Yellow Warblers have yellow in the tail and a
fairly obvious yellow eyering. Wilson has a one color
green/brown tail and a yellow face.

Truth be told sorting out female Common Yellowthroats
from Yellow Warblers can be the greater Id challenge.

Bob Mauritsen wrote:
>
> So how many years does one have to bird before one
> can make a differential ID between a female yellow
> warbler and a female Wilson's warbler, even if they
> sing a bit. In fact, do the females sound like the
> males?
>
> bob mauritsen
> green lake
> seattle

--
Mike Patterson
Expounder of Scientific Wisdom
Astoria High School

He that troubleth his own house
Shall inherit the wind."
Proverbs 11:29