Many shells I find have holes bored in them, very precisely, and usually at the end of the shell. How did the holes get there?
Many mollusks prey on other species of shells by means of drilling. This means that they use specialized mouthparts and enzymes to excavate a circular hole through the shell and then insert their proboscis to eat the soft body parts of the clam or other shell. Sometimes octopi also drill holes in shells to get to the tasty animal inside.
