Anyone can see this evidence for evolution with their own eyes.

"We've already learned that some species of whales retain vestigial pelvises and rear leg bones, but about one whale in five hundred is actually born with a rear leg that protrudes outside the body wall. These limbs show all degrees of refinement, with many of them clearly containing the major leg bones of terrestrial animals--the femur, tibia, and fibula. Some even have feet and toes!"
-- Why Evolution is True by Jerry Coyne

Why are some whales born with legs, feet, and toes? The only possible explanation is whales evolved from land animals.