Invertebrates are the garden pests that eat cantaloupe. The edibles in question (Cucumis melo) attracts particularly such garden insect pests as:
Garden snails !!
Termites
They eat pest insects that would harm your garden.
arachnid ant aphid
slug, i think!
You can try Fertilo which is a very organic pesticide. There are plenty of other means that can keep you and your garden safe from pest.
It would help but no it can't completely keep it pest free
Crows, aphid
A gardener
spitter bug
Yes, you can identify pest droppings in your home or garden by their size, shape, and location. Common pest droppings include small pellets or droppings that may be dark in color. It is important to properly identify the droppings to determine the type of pest present and take appropriate action for removal.
Why is the caterpillar considered a plant pest at that stage in its lifecycle? Because it eats our (human) food and thus destroys it.