| In some chitons, the radula has teeth tipped with magnetite, which hardens them. |
| A radula is the 'tongue' of molluscs, a horny strip that is continually renewed and has teeth on its surface. |
| The dog-whelk's radula drills into other animals such as barnacles, while the limpet's is used to rasp algae off rock surfaces. |
| What's more, the radula, a harpoonlike stinger that delivers the venom, can strike with enough speed and force to pierce a diver's wetsuit. |
| Conus is accused of having a poison-gland connected with the radula and of having shown vicious traits when captured. |
| It uses its tongue, called a radula, to scrape the surface of rocks as it crawls along. |
