Spiders, whose ancestors antedated the dinosaurs, have lived on the earth for millions of years. During that time they have picked up a few tricks besides the fly-catching web. There are spiders that look like ants and live with ants; others change color, like chameleons, according to the hue of the flowers on which they wait for prey.
In Australia and Africa there are spiders that catch their victims by a sort of combination lasso and harpoon. They attach a drop of sticky gum to a length of silky thread, and whirl this apparatus around...
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