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hmmm. Actually one way to measure the success or failure of a species is how quickly it changes into something else. I once heard it said, "humans are an evolutionary mistake waiting to be corrected."
Sharks are SO much older than us but have changed very little. Spiders have changed even less. Humans however are changing rapidly... we are losing our little toe, we're getting much larger, our organs are changing, we're living far longer and women are having longer reproductive years... from an evolutionary point of view, we are changing because we were not suited to our environment as we were. Sharks and spiders on the other hand are of such good design that they are far better at surviving and adaptation, even through some dramatic climatic changes.
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