Dog Whelk

Amanda Morgan Period 2


  • Rocky mid-inner tidal
  • Mussel and barnacle zones
  • Bering Sea to Mexico

Daily Changes

  • Desiccation: Holds water in operculum and/or moves to moist area
  • Wave action: Goes to more sheltered shores, thick shell, muscular foot, hiding in between rocks
  • Salinity: evolution-being able to naturally withstand change, moves to different water source
  • Interrupted Feeding: hides in shell from waves, overeats in order to survive until next feeding time.

Special Characteristics

  • Thick shells: protection from crabs
  • Large foot: helps for attaching onto rocks


  • Moves using its foot

Food and Predators

  • barnacles and mussels
  • radula (tooth for removing flesh)
  • drills holes in prey's shell
  • injects enzymes into prey that turns it into soup which is sucked out
  • eaten by birds, crabs, other crustacean

Interesting Facts!

Turns tongue into straw which is used to suck up their soupy prey

An operculum is a "little trap door" or lid that is attached to the foot and closes when snail is inside shell