This is a really easy to make and uses some very common material, which yarn. You can use any weight, gauge or any type of yarn to make these adorable yarn ball caterpillar.
The size can be easily adjust by making the ball size bigger or smaller to suit your need. Or you can add the quantity to make the caterpillar longer.
Close up of the caterpillar:
Watch here on how to make the caterpillar: