If you mean evidence for one kind of critter changing into another kind of creature, there is no evidence. The fossil evidence doesn't show any animal turning into a human being except of course for the cartoon drawings in our old high school text books. Even Charles Darwin thought his own theory was grievously hypothetical and gave emotional content to his doubts when he said, 'the eye to this day gives me a cold shudder.' to think the eye had evolved by natural selection, Darwin said, 'seems, I freely confess, absurd in the highest possible degree.' Of course, anyone who has knowledge of the intricacies of the human eye and other living structures immediately realizes the problem Darwin sensed. How could an organ of such an intricate magnificence ever have a originated via random chance?