Keeping a List of a Monarch's Needs Organisms have basic needs. They can survive only in environments in which their needs can be met. Keep a list of a monarch's basic needs for survival: Needs as an egg: Its own milkweed plant (or leaf) Space so another monarch caterpillar doesn’t eat it Space so a “queen” caterpillar doesn’t eat it   Needs as a larva (caterpillar):       Needs as a chrysalis:       Needs as an adult:         Copyright 2006 Journey North. All Rights Reserved. Please send all questions, comments, and suggestions to our feedback form