If a toad is put into a tank with dead worms, it will starve to death because it won't recognize the worms as food. Toads have evolved to only see horizontal lines moving as food. This theory was tested in the 1970's, when scientists placed a toad into a glass jar and had a vertical line pass by to which the toad did nothing, almost as if it has no concept of the line infront of it which looked like a worm standing straight up. Once the line was changed to become horizontal, the toad immediately...
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