If we needed any other reason to consider a spider life precious, there's the fact that – just as with all animals alive today – each individual arachnid is the product of an unbroken line of successful ancestors that stretches back to the first life on earth 3.8 billion years ago. Against staggering odds, that particular spider's parents and grandparents and great-grandparents – and so on, for millennia – managed to survive long enough to reproduce. Then a heavy-footed human steps on the spider in the bathroom because it's a minor annoyance.

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