I was observing this female Brimstone Butterfly as it was moving along a bush and laying eggs as it went along.
It was then disturbed by a passing male and a short display of aerial activity occurred.
This provided some opportunity for fast shutter speed shooting, although I didn't have the ideal lens at the time.
The shot below was taken at the time that the female was launching herself into the air, hence the open wings position which one doesn't normally see.