Examples of this group are snails, clams, oysters, slugs, squids and octopus. The next group is the arthropods. These animals have an outside skeleton, jointed legs and segmented bodies. Three-fourths of all the animals are arthropods. Some live on land, and some live in water, and some can fly.
Some arthropods are bees, crabs, shrimp, spiders, beetles and millipedes.
The last group is called the spiny-skinned animals. This group has sharp spines on the outside of their bodies, which form a skeleton for protection. Spiny-skinned animals have tube feet and live in the ocean. Some examples of this group are starfish, sand dollars, and sea urchins. Now, on a sheet of paper, write the six groups of invertebrates.