Seen amongst sand dunes on the Sefton Coast
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What the food-plant was? Looks a bit like Sea-Beet.
Many caterpillars eat only one or a few food plants: these can be easier to pin down than those that will eat anything green!
I'm afraid I don't know the food plant. It was on a dead twig when I found it.
Lat/Lng: 53.494, -3.053
OS grid ref: SD302002