Jane FD's picture

Chalkhill Blue

Observed: 5th August 2009 By: Jane FD
S159 Neighbourhood Nature - course complete
Jane FD’s reputation in InvertebratesJane FD’s reputation in InvertebratesJane FD’s reputation in Invertebrates

On bank of canal.

Species interactions

No interactions present.

Species with which Commn Blue (Polyommatus icarus) interacts


bobthebirder's picture

blue butterfly

Certainly a Common Blue, from the habitat and details visible on the photo. If you look at the original, and zoom in to the top of the butterfly's wings you can just see a glimpse of the upperwing, showing a bright blue colour and a hairline black border. Chalkhill would show a thicker black line and pale blue colouring. And chalkhills never stray away from limestone/chalk coasts or downland.

Best correct the typo in the ID before I give you a spot-on!

Bob Ford

JaseJ's picture

Chalkhill Blue

I can see why you might think this is a Chalkhill Blue, as there isn't much sign of orange on the underside of the forewing. However, your butterfly is looking a little battered and it always seems to me as if the orange marks are the first to go. Bob's observation of the little bit of the bright blue showing from the upper wing surface is key though. I've posted some Chalkhill Blue images that show the males are far paler and have wider black borders: http://www.ispot.org.uk/node/3760 I also have some Common Blue images for further comparison: http://www.ispot.org.uk/node/2982