Phylum Mollusca - Mollusks - includes snails, slugs, clams, scallops ...

Varied feeding habitsTerrestrial herbivores can be serious garden pestsOyster drills bore into other mollusk shells, kill and eat bodyCone shells are predators with harpoon-like radulaSome sea slugs (nudibranchs) eat cnidarian polyps andincorporate stinging cellsTerrestrial forms evolved a rudimentary lung under mantleAir has much more oxygen than water - a lung is moreefficient than a gill in airFreshwater forms evolved from terrestrial forms and lack gills