"The fox knows many things, but the hedgehog knows one big thing" - Which is?

[Carson_O_Genic]

@astro

“The fox knows many things, but the hedgehog knows one big thing”
Is there any indication of *what *precisely the hedgehog is supposed know in the context of the ancient example?

When the hedgehog curls up in defense, he presents a large spined ball impenetrable but for an underground attack.
Despite his wiles the fox has yet to develop a shovel, or guard for his nose.