It is called and "Army"
i don't know what catipillers are... but caterpillars don't...they eat leaves
by catipillers eating the salt and forming it
i would suggest sevin dust
Caterpillars are usually found on plants, especially on leaves where they feed. They can also be found crawling on the ground or in trees. Caterpillars are more commonly seen during the warmer months when they are actively feeding and growing.
this may be a Luna caterpillar
Basically ther are more catipillers born than can be eaten, so some survive.
A group of Dolphins are called a Pod
A group of dolphins is called a pod. If that is your question.
A group of shrews is called N.O.W.
a group of Blackbirds is called a murder
A group of hens is called a brood.
A group of martens is called a richness