Replying to @foreverparks666 these teeth let them bite into tough kelp holdfasts. When they population gets unbalanced (usually from lack of predators) sea urchins can wipe out entire kelp forests, creating urchin barrens. #kelp #seaurchin #salishsea #tidepool #intertidal #lowtide #echinoderm #marinebiology #portofseattle