Caterpillar on Willowherb

Caterpillar on Willowherb

Observation - Caterpillar on Willowherb - UK and Ireland. Description: Looks like a geometer moth caterpillar. Food plant (Hoary) Willowherb I think (although this is not the leaf it was photographed on). Around 25mm long.

Looks like a geometer moth caterpillar. Food plant (Hoary) Willowherb I think (although this is not the leaf it was photographed on). Around 25mm long.