Sand scarab larva

Track marks in the sand.

Seen those funny little narrow double tracks on the beach? It's a Sand scarab beetle larva:

Pericoptus truncatus is the largest of the New Zealand native scarab beetles. … The larvae, pupae and adults are common amongst the roots of marram grass and under or within driftwood. 

Sand scarab larva with its many legs.
Larva, front view, with distinctive tracks behind it.
Miraz Jordan @WaikawaNews