After a caterpillar eats a leaf, it can convert the chemical energy into energy to it build a cocoon.
heat
nuclear
chemical
mechanical

After the caterpillar eats a leaf, it can convert the chemical energy into mechanical energy to help build a cocoon. The leaf as their source of food contains mostly of starch and cellulose. This must be break down into smaller compounds by enzymes. The smaller compounds will enter into the different parts of the caterpillars’ body for nutrition. The nutrients that are received by its body will be used for other body processes such as movement in building a cocoon.