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I don't think I know how to tell Eyed Hawk caterpillars from Poplar Hawk caterpillars, does anyone else? Your photo does look most like Eyed, but from the pictures I've seen both species vary. What was it feeding on, some sort of willow?
Entomologist and biological recorder
feeding on Salix and it happened to be under the twig as shown in picture
Lat/Lng: 51.818272, -0.645282
OS grid ref: SP934141