We have had a few of what people are calling 'Japanese beetles' in the garden this year. I have been zapping them with our bug zapper.
A few days ago I collected 5 or 6 eggs on newly emerged milkweed in the garden. They started hatching two days ago. They're about 1/8" long at first and by the time they pupate (form the chrysalis) they will have grown 2000x in size and 3000x in weight.