The adaptation of the legs to the fins and tail serves to make swimming faster and easier in the water. The blowhole slowly moved towards the top of the head, making it easier to breathe while swimming. Whales have also developed blubber, which provides us with energy during times when food is scarce or during long journeys. To survive in the ocean, whales had to adapt their lungs, so they could breathe more easily and hold their breath for long periods of time when submerged underwater (Evolution and Adaptation of Whales, no date). Whales have made many adaptations to live in the ocean