How does evolution change animals?

Simply put, evolution is a change that occurs within a species, and it is easy to see examples of this kind of adaptive evolution in the natural world.

Because of genetic mutations that allow for increased absorption of sunlight and the production of vitamin D, people with lighter skin tones have an adaptive advantage over those with darker skin tones. This is especially true of humans living in Iceland and Denmark.

The formation of the Grand Canyon in Arizona divided a population of squirrels; those on the colder north rim have evolved thicker fur, and they are larger than their cousins on the warmer south rim.

White skin is actually a harmful mutation in most environments, as sunburn and skin cancer are far more common in white people than in the general population. It is evident that animal populations can change to adapt to their surroundings, but this form of evolution is the selection of mutations and variations best suited to a particular environment.

Actually, there isn't any concrete empirical proof that evolution—of any kind—can transform an animal species into a different species.

Evolution changes animals through genetic variations that arise randomly. Those with advantageous traits have better survival and reproduction chances, passing these traits to offspring. Over time, beneficial traits become more prevalent in a population, leading to adaptation and species diversification.