Named for its large size and its strong, dog-like teeth along the hinge of its shell. A cockle that does not burrow. Its shell is covered in strong, radiating ribs that make it stand out from the smooth-shelled pipi and tuatua. Unlike the common cockle (tuangi), the dog cockle does not burrow into the sand. It lives on the surface, often in large beds visible at low tide. This surface-dwelling habit makes it more vulnerable to predators and to human harvesters. A cockle that lives in the open. The dog cockle's ribs are not just decorative. They strengthen the shell, allowing it to resist the crushing attacks of crabs and starfish. The shell is thick and heavy for its size, a sturdy fortress against the dangers of the intertidal zone. When the tide goes out, the dog cockle closes its shell tightly, trapping a small amount of water inside to keep its gills moist until the tide returns. The Māori name Kuhakuha means to cough or puff, possibly referring to the way the shell opens and closes. When a dog cockle is exposed at low tide, it will sometimes snap its shell shut, expelling a jet of water. That puffing sound, repeated across a bed of thousands of cockles, creates a soft chorus on the quiet beach. Its strong, ribbed shell has been used as a tool and as a decoration. The radiating ribs make it easy to grip, and the shell is strong enough to use as a scraper for working wood or cleaning fish. Today, it is more commonly collected by beachcombers who admire its architectural beauty. The low tide beach is quiet. The dog cockle lies on the sand, ribbed shell thick and heavy. A crab approaches. The cockle snaps shut. The crab gives up. The cockle does not know it is a fortress. It does not know its ribs are weapons. It just wants to filter water. A clean dog cockle shell, bleached white by the sun, is a prize find on any sandy beach. The ribs catch the light, casting shadows that emphasise the shell's elegant geometry. The dog cockle is proof.