Many people are now thinking Darwin was wrong. One of the groups are now leaning more towards Jean-Baptiste Lamarck, who preceded Darwin.
Neither understood the complex mechanisms their theory replied up. Instead of mutation Lamarck suggested use lead to newer traits. The classic example is the giraffe neck. By stretching the neck became longer.
Sound absurd? Not really. DNA that was once seen as junk is now being understood. Some of that DNA is triggered by use and environmental feed back mechanisms.