Use a hatchet or megatherium to harvest for max silica pearls and oil. Gives about a stack of chitin with a primitive metal hatchet and loads with the mega.

They seem to spawn in the south of the standard island map, usually near the water on a Sandy bitch at dusk and dawn

Trilobites... Also known as the Cockroach of the Sea!

The most dangerous creature. Bring similarly dangerous dodos.