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This Mule Deer visited our yard recently. It is an excellent example of how natural selection works. Why?

Answer:

While Mule Deer have many adaptations, this one has a very unusual one. Notice that the antler point that is furthest back has two small points. More and more Mule Deer are showing up with asymmetrical and distorted antlers. This is because hunters prefer deer with a perfect set of antlers, and will often let a buck with poorly shaped antlers pass in favor of waiting for a better trophy. This has increased the number of Mule Deer that are genetically prone to asymmetrical antlers in the breeding population, which means that more and more young deer are showing up with strange antlers.
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