From eggs 2 or 3 mm in diameter to caterpillars the size of your forefinger in 6 weeks, the growth of the large silk moths is prodigious. The changes in size and coloration of the caterpillars are remarkable, but nothing as completely transformative as their progression from caterpillar, to dormant pupa, to a moth bigger than your hand.
These are images of the development of the Cecropia moth, Hyalophora cecropia, North America's largest.
From eggs that were laid on 19 May, these tiny beings emerged:
Feeding on nothing but lilac leaves, they have gone through three molts and have increased in size by a factor of about 40 in about a month.