![]() In nature there is no actual dividing line that separates animals with backbones from those without one, but grouping the members of the kingdom Animalia in this manner allows biologists to sort them into very broad groupings. ![]() An invertebrate may be as soft as a jellyfish or as hard as a lobster but they have one distinction in common-they have no bony vertebral column or backbone. They inhabit nearly every type of environment on Earth and vary greatly in the way they live and reproduce. Of the roughly 1,500,000 different species of animals in the world, more than 95 percent are invertebrates. Within this seemingly simple grouping there is an amazing variety of complex life forms: from sponges and starfish to earthworms, clams, spiders, and butterflies. An invertebrate is a multicelled animal that does not have a backbone.
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