At the 4th checkpoint, the part with the barrels and the see-saw, jump onto the top platform and ramp off the barrel. Land on the see-saw and drive backwards to tilt the see-saw to the left. Bailout backwards over the cage, but under the platform and land in the pit. A squirrel can be seen caught in a spiderweb.
This section is reserved for Confirmation/comments about this investigation. Investigations will remain open until advised by Redlynx that the final solution for each secret is found.