Animals that don't have a backbone include insects, spiders, scorpions and cephalopods. Bivalves such as clams, mussels and oysters lack a backbone, as do jellyfish, starfish, sponges, sea cucumbers and sea pigs. Crustac... More »

Animals without a backbone are called invertebrates. These organisms lack a spinal column and cranium base in their body structure. There are over 1 million known species of invertebrates. More »

Animals with backbones are called vertebrates, and all vertebrates have a well-developed brain and a living endoskeleton, among other things. An endoskeleton is one that is made from bone or cartilage and grows and survi... More »

Animals with exoskeletons include all arthropods such as insects, crustaceans and spiders as well as many other invertebrate animals such as shelled mollusks. Shelled mollusks include snails, tusk shells, clams, nautilus... More »

Arthropods, such as insects, shrimps, spiders, centipedes, crayfish, scorpions and millipedes, are the most diverse group of animals in the world. They can be seen on land, in the air and in the sea and are classified un... More »

Invertebrate animals are animals that have no backbone and are cold blooded, meaning they cannot regulate their own body temperature, according to the National Wildlife Federation. More »

All centipedes are predators, generally feeding on other invertebrates such as insects and spiders, although larger species will feed on small vertebrates such as lizards. They hunt using the legs on their first body seg... More »

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