Autodidact
Intentionally Blank
Science is working on that, but be sure that there is one.
But you asserted that they do. Now you're saying you don't know what it is? Did you want to withdraw your assertion that they do--Beetles, have a purpose that is? Otherwise you're going to have a bit of a credibility problem.
No, science is not about ultimate purpose. It's not working on that, and will never find it.