We had a very lovely visitor to the garden recently - a Hummingbird Hawk-moth (Macroglossum stellatarum). This is only the third one I've seen in six summers here (although it's likely that others have gone unnoticed).
It didn't hang around for long; for just a few minutes it zipped around from flower head to flower head, accessing the nectar from the tubular flowers (no, I don't know what they are!). I took many, many photos and managed to get half a dozen in focus. Thank goodness for digital photography!
The Hummingbird Hawk-moth is a smallish (wingspan about 2 inches) day-flying moth. They migrate to the UK in the summer from southern Europe and Africa, and it's thought that with a warming climate they may colonise the UK.
If you'd like to help monitor these amazing beasties, Butterfly Conservation is running a Migrant Watch Survey for Hummingbird Hawk-moths and Painted Lady butterflies - it's easy to add your sightings and contribute to understanding the arrival, spread and departure of these migrant insects.