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Insects are the most diverse group of animals on the planet. Scientists estimate that there are 4 to 6 million species in existence and discover approximately 10,000 new ones every year. As invertebrates, insects have an exoskeleton instead of an internal structure. They undergo either complete or incomplete metamorphosis, undergoing radical changes in appearance between egg and adult.
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Monarch ButterflyThe migratory habits of the monarch mean that habitat must be preserve for it in several countries. |
Nature picture credits (top to bottom): Photo © Steven Katovich, USDA Forest Service, United States (Monarch closeup).
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