2ND PHASE
When the egg hatches, a larva emerges. You can also call it a caterpillar. Monarch caterpillars have a distinctive set or yellow, black, and white markings, as you can see in the picture.
The caterpillar will eat the milkweed, which is the plant that it was hatched on. This is the time when the caterpillar does most of its growing. It does nothing but eat and grow. It will take very few breaks, even for resting.
As the caterpillar grows it will become too large for its skin. It molts or sheds its old skin, revealing new skin underneath. This happens over the course of 9 to 14 days before the caterpillar will enter the next stage of development.