Clovers brought in from the garden three weeks ago to feed them happened to have a tiny Common Blue Butterfly (Polyommatus Icarus) caterpillar feeding amongst them.
A pleasant surprise given that there are very few sightings of Common blue in the garden each year.
Gallery of other British butterfly caterpillars
The Clouded Yellow caterpillars are already 35mm and preparing to pupate while the Common Blue is still barely 5mm and preparing to over winter.
Both Clouded Yellows and Common Blues have been seen in recent days laying in good numbers on birdsfoot trefoil and clovers around the Lizard Peninsular coastline in south west Cornwall.