When did dolphins evolve?

Answer:

Dolphins evolved from whales, and both of them evolved from ungulates, hoofed animals, that ate meat and took to the water. Early whales, like Himalayacetus subathuensis, lived on land but possibly lived like crocodiles.

Answer:

Dolphins and Whales are related to each other, so that means that Dolphins evolve from a Dinosaur named Ichthysaurus.

by: Abdurabi

Answer:

According to the National History Museum, London, dolphins have an ancestor in four-legged mammals similar to wolves. They used to have claw like hands which caught fish they gradually became more fin like and that is how they evolved into dolphins.