Did dolphins ever walk on the earth?

Dolphins did not walk on the earth in the way terrestrial animals do today, but their ancestors were land-dwelling mammals. Around 50 million years ago, these early ancestors, related to modern-day hippopotamuses, gradually adapted to aquatic life, leading to the evolution of dolphins. Over time, they developed physical adaptations for swimming, such as streamlined bodies and flippers, completely transitioning to life in the water.