yes they did at one time walk on land. Their fins used to be types of small legs that would help them walk on land.
killer whales are mammals but they can not live on land beacause they are to big and can not walk with flippers.
No, they have flippers for moving through water, not the strong legs they would need to support their great weight on land.
no.
Whales have adapted to an aquatic niche, because that is the direction in which their evolution took them. Every organism finds some speciality, and the cetaceans (of which whales are a variety) have specialized in a water-based existence, becoming very good swimmers, having great ability to hold their breath, and so forth. Those species that walk on land have chosen another niche.
Not as whales, no. Marine (sea) mammals (whales, dolphins, etc.) are descended from terrestrial (land) mammals, but they're not identical with those land mammals... among the more obvious changes, they've lost their legs. The related links section has a link to a Wikipedia page showing what some of the distant ancestors of whales might have looked like.
In 2008, scientists discovered the fossils of an animal they believed was an ancestor of today's whales. The unique feature of this animal was that it had legs and possible spent a lot of time on land as well as in the water.
Ambulocetus, is the ancestor of the whales. It was known as the walking whale because it could walk on land, though it spent most time in water.
No
no
On Land
No if they were they be on land
No. They never had had feet before.