Why does the red back spider have a red back?

Nature has a way of letting other creatures know that there is danger about. The red marking on the back of the red back spider is there to warn you not to step on it and to frighten you away. Over the many years a creature develops the survivors traits are strengthened and in the case of the red back spider ( a close relative of the black widow spider) having the marking on the back has proved to be an advantage.

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