Even though the adult form of the puriri moth lives for only two days, the caterpillar form can live for up to 5 or 6 years. The grubs gnaw their way into a tree and form a little burrow where they will sit. And sit. And sit.
Recently, a scientist caught on camera for the very first time a puriri moth hatching out of its chrysalis. It's awesome to see its wings unfurling. The footage is here. I definitely recommend that you take a look!