How are spiders different from other animals?
About 3,000 species of spiders live in the United States. Of those, only two are truly dangerous to humans: the black widow and brown recluse. The range and variety of spiders are like no other animal on Earth: they live in cold or hot extremes; in sand or water; in attics or underground; they wander or hardly move at all; they are microscopic or as big as a fist; they look like ants or bird droppings; they can live for twenty years or die after mating. The earliest fossil evidence of spiders came from New York in rocks from 380 million years ago. The fossil spider has the silk-spinning organ, the spinneret. This, with the silk-producing gland, is unique to spiders.
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