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WHAT IS AN INVERTEBRATE? An invertebrate is any animal that does not have an internal jointed skeleton. The term includes a wide diversity of animals, ranging from microscopic worms to giant squid, with little in common except the lack of a vertebrate skeleton. Some have soft bodies and many others have protective shells. But the most abundant are the amazing variety of crustaceans, insects, spiders, and similar animals that have hard, jointed external skeletons—the arthropods.
WHAT IS A FISH? Fish are easy to recognize, but harder to define. They include three distinct groups of animals, most of which breathe through gills but are otherwise quite different. But a typical fish is a streamlined swimmer that propels itself through the water using strong muscles anchored to a flexible backbone.
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