Wrong - Brown Argus.

Wrong - Brown Argus.

Observation - Wrong - Brown Argus. - UK and Ireland. Description: In the bird world, one of the constantly recurring debates is Chiffchaff/Willow Warbler; in the butterfly world it's Brown Argus/Common Blue female. I think this is a Common Blue female 'cos there seems to be a very slight but noticeable blue tinge to

In the bird world, one of the constantly recurring debates is Chiffchaff/Willow Warbler; in the butterfly world it's Brown Argus/Common Blue female.

I think this is a Common Blue female 'cos there seems to be a very slight but noticeable blue tinge to the body near the wing roots.