Twig like caterpillar on Hazel
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The dorsal bumps and head are quite distinctive and are right for Early Thorn, some of the other close relatives are a bit like it(Purple Thorn is a lot more knobbly) but not so close as to be confusable. Your larva is a perfect match for those in ukleps down to the curved white lines underneath the bumps on the back.
Thanks for the info. I nearly didn't see it and rubbed it off the Hazel twig before I realised it was a bit squishy! I loved the way it could rear its head and look like a bent twig.
Lat/Lng: 53.17982, -1.45089
OS grid ref: SK367648