The [[knobbed whelk]], ''Busycon carica'', is the second-largest species, ranging up to 12 in. (40.6 cm). They have [[tubercle]]s (or spines) along the shoulder. Knobbed whelks eat clams. They open the clam with their hard shell and insert their long proboscis. Today the knobbed whelk is a common predator of the [[Foreshore|intertidal]] mudflats and can be found offshore to 26 fathoms (48 m). The [[channeled whelk]] is slightly smaller than the knobbed whelk and has a smooth shell with channels following the swirls at the top of the shell. | The [[knobbed whelk]], ''Busycon carica'', is the second-largest species, ranging up to 12 in. (40.6 cm). They have [[tubercle]]s (or spines) along the shoulder. Knobbed whelks eat clams. They open the clam with their hard shell and insert their long proboscis. Today the knobbed whelk is a common predator of the [[Foreshore|intertidal]] mudflats and can be found offshore to 26 fathoms (48 m). The [[channeled whelk]] is slightly smaller than the knobbed whelk and has a smooth shell with channels following the swirls at the top of the shell. |