What happens to the hard parts of prey like shells after a walrus finds them?

Answer

They are crushed using molars and premolars before soft tissues are swallowed.

Once the prey is inside, the walrus crushes the hard shells or exoskeletons using its molars and premolars, effectively grinding the food before swallowing the soft tissues.

What happens to the hard parts of prey like shells after a walrus finds them?
dietanimalmammalwalrus