These large solitary wasps can be up to 25mm long. I saw both the wasp and moth caterpillar tumble out of a small tree onto the ground. The wasp then quickly imobolised the caterpillar and started the arduous task of dragging it to the tunnel where she will lay an egg in a chamber. The egg will develop and her offspring will hatch to feed on the caterpillar. She seals the end of the tunnel with sand and debris to camouflage it. Taken at Devon Wildlife Trusts Bovey Heath Nature Reserve.