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Natural selection is like a tax cut, I hear it exists but real examples are hard to come by.

One evolutionist says stripes on a zebra are an example of natural selection for living in the tall grasses but how then does one explain another zebra, the quagga, which is only striped on the front part of its body. Or other prey animals that live in the same location that have no stripes.
Did natural selection quit half way through the process on the quagga?
How to explain the difference in lions and cheetahs that prey upon the same animals in the same areas yet are very different in their habits and appearance.
Both survive so which traits are being selected for survival?

Natural selection sounds like a far too random a process to produce anything more than minor differences.