Local naturalist Tor Hansen will explore biological diversity in thriving and declining populations on our Cape Cod shorelines. Through his discoveries, illustrations, colorful photos, and astute observations, we will learn more about our local biodiversity and replenishing and diminishing marine food chains. Tor examines tideline seaweeds, searches for sand dollars, stranded fish, whelks, and horseshoe crabs along the shorelines, and should find, in tidewater estuaries, a potpourri of fish, anemones, tunicates, and mollusks. Image: Tor Hansen.