Animals without backbones are called invertebrates. They range from well known animals such as jellyfish, corals, slugs, snails, mussels, octopuses, crabs, shrimps, spiders, butterflies and beetles to much less well known animals such as flatworms, tapeworms, siphunculids, sea-mats and ticks. read more
All invertebrates starting from unicellular protozoa (e.g. Amoeba, Entamoeba, Euglena, Paramecium, Plasmodium etc ) to multicellular echinodermata (e.g. Starfish, Sea-urchin etc) are some examples of animals without bones. read more
Those bones are called vertebrae so the animals are vertebrates. The animals that do not have backbones are called invertebrates. Some examples of vertebrates include human beings, cats, dogs, fish, elephants, and chickens. Some examples of invertebrates include spiders, worms, and flies. read more