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This change seen in squirrels is not an example of evolution. Living things possess the ability to adapt to climatic conditions. This is well known, and it has been proven many times that it cannot bring about evolution. The statistical analyses put forward for the claim that climatic changes led to genetic change in squirrels have no evolutionary significance. Until the gene which controls this behavioral alteration and the mutations that took place in it during this 10-year period are identified, the claim can go no further than being a fairy tale.
It remains to say that even if there were a mutation that altered the time squirrels give birth, that would still not constitute proof of evolution. The theory requires mutations to produce new genetic information, new organs, and new biochemical structures. In other words, mutations must bring about "vertical development." Even if it had to do with a mutation, a change in the time at which squirrels give birth would not mean the emergence of a new organ, a new system, or a new biochemical structure. It would only be a "horizontal variation," for which reason it could not be described as "evolution."
