Bee or butterfly, of course. A selection of shots showing competing species after pretty much the same thing from the same place. I was focused on the female Large White (Pieris brassicae), when the White-tailed Bumblebee (Bombus lucorum) drifted into shot. The butterfly seemed unperturbed, so I carried on shooting until (the final image) it decided to move on.
All images Canon 1Ds MkII, Canon 100-400mm IS USM lens, 1/800 sec, f/10, 400mm at ISO 400