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Chris.I am sure that the Hawk moth had just hatched out locally as it was in pristine condition. Two years ago I had one in the garden in June and then found a larva crawling along the garden path in August. I collected it and gave it to my grandchildren in Edinburgh who overwintered it in their garage in Edinburgh hoping to have a moth hatch out but when they checked it in April, there was no trace of it.I found out from a member of our local Scottish Ornithologists Group that there has been a colony of Holly Blues in Belle isle park in Ayr, for over 10 years.My garden would also seem to be the ideal habitat with the gable wall covered in ivy and a mature Holly tree within 8 feet of the ivy.I am convinced that my Holly Blue had just hatched in the period of warm weather as it was in a fresh condition..
The change in butterfly and moth populations in the last 40 years has been spectacular. Forty years ago there were no peacocks, commas or orange tip butterflies in Central Scotland (Stirlingshire and South Perthshire). Now all three are reasonably common here. I can't comment on the moths as I stopped trapping on a regular basis twenty years ago, and many moths migrate long distances, whereas butterfly migrants tend to be restricted to a few well known species, and none of the above.
We have found the same in the east of West Lothian. I remember getting very excited when the kids said we had Peacock butterflies in the garden. It was about 10 years after that before we saw the Orange tips. Both are now common but the Comma is a rare visitor. I thought I might have bought them in on plants from south of the border. Tortoiseshells used to be our most common species but even they are seen less often. I caught this one feasting in the garden last evening.