Caterpillar

Caterpillars are the most numerous collectable in Knock on Wood. There are 100 in each level to find.

Background
For centuries, Caterpilars have been used as both a food source and currency in Arboria. In recent years, General Ryvok has been taking 100 caterpilars from every person in Arboria yearly, and those who don't get left for dead in the middle of nowhere. They are modeled after the Elm Sawfly Larva, AKA the Canadian Yellow Catepillar.

Usage
In Knock on Wood, they're used as both currency and are necessary to beat the level. Some doors will by blockaded by Ryvok's troops, who will only let you past if you bribe them. Other NPCs, like the Sailor in Mystic Woodlands, will charge you Caterpillars to get to certain places that are necessary to go to complete the level.