Just by accident.

       Well, more or less.  I went out for "the Wander" and, held a minor Census.  One of them took off from a Flower and landed thus; it's the second time it's happened that I've seen.  It wasn't the warmest of days, for a change & I wondered if s/he was charging his/her Batteries by the warmth of the Stones?  Last time it was a Peacock.