Knobbed Whelks are large snails that feed primarily on hard shell clams. Using their powerful foot, a whelk is able to pull open a clam and feed on the soft tissue inside.
Knobbed Whelks can grow shells up to 8 inches long. Female whelks attach strings of egg capsules to hard surfaces such as rocks. Each egg case contains 20 to 100 eggs which hatch into miniature whelks.
From left to right:String of Knobbed Whelk egg cases, Whelk shells from one of the egg cases