Holly Blue Butterfly- If you live south of a Cumbria/`Durham line, and you see a fast-moving blue Butterfly zig-zagging through your garden or park it is most likely to be the delicate Holly Blue. Hard to photograph, this female of this blue Butterly has a dark edge to its forewing. The larvae, which feed mainly on Holly, Ivy and Spindle are parasitised by the Ichneumon Wasp. causing huge variations in populations from year. We have only seen one this year in the garden, but it is a really poor year for Butterflies in general. Conditions: Very sunny. Temperature: Max 22- Min 13C.