Bugs and caterpillars. A small ‘bug’ barely 3mm in length found in the garden a few weeks ago which eventually a few weeks later turns into ……… the colourful Hawthorn Shield bug (15mm in length). Another garden find, this caterpillar 25mm in length will go through the pupa stages to become ………. the Grey Dagger moth (Wingspan 30 to 40 mm), given its name from the black dagger line markings on its forewings. and this caterpillar 60+ mm long will eventually become ……. The Elephant Hawk moth (wingspan 45 t0 60mm).