Crazy Caterpillars!

We have big caterpillars, teeny tiny caterpillars and medium size ones. As there is only one swan plant we have noticed the big ones follow eat other and seem to fight over the leaves. We think the mean one bites anyone in his way as well.
One even hung in a j shapes ready to change but he didn't. He must have been just pretending or trying it out.
The caterpillars are keeping us entertained.