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About Insects
We live in a world of insects. Close to one million different
species of insects have been identified (compared to only 4,000 or so mammals). That
makes insects the most abundant group of creatures on earth. They are found all
around the world. One acre of ground may be home to more than a million insects!
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| Insects are part of a large group of animals called invertebrates.
Invertebrates do not have a spine (a backbone). Instead they have an
exoskeleton -- a hard outer shell that protects them. All insects
have 6 legs. Spiders aren't insects, they're arthropods. You can tell they
aren't insects because they have 8 legs.
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Most adult insects have three major body parts: the head, thorax
and abdomen. The head includes the eyes, antennae, and mouth. The thorax,
which separates the head from the abdomen, is where the insects wings and legs are
attached. The abdomen is the largest part. It houses the insect's heart,
stomach and tubes used for breathing.
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