In his magnificent publication Life Cycles of British & Irish Butterflies, Peter Eeles quotes the words of James Tutt, from his 1906 work A Natural History of British Lepidoptera, about the flight pattern of the beautiful Brown argus (Aricia agestis)

This species may be called the ‘zigzagger’, for it darts swiftly to and fro in flight, showing first its grey underside and then its black upperside, so that one can hardly follow it with the eye.

Tutt describes the Brown argus’s movement perfectly. If you take your eye off this tiny butterfly for a second, it disappears, and I’ve spent many a minute, or ten, waiting patiently for it to move again before being able to get a good enough view first to identify the butterfly and then to edge close enough for photos. It’s certainly worth the wait though.