Whales, the largest beings of the sea, were once expensive with land that went on four legs. About 50 million years ago, their ancestors roamed the coasts and developed into the marine giants we know today.

One of the first whales, Pakicetus, was a goat-sized creature that lived along the banks of lakes and rivers in today’s Pakistan.

Although it did not look like a whale, Pakicetus showed remarkable adjustments to life in the water, including the ability to hear under the water.

Pakicetus’ descendants continued to adapt, led to the development of Ambulocetus, who lived between 50 and 48 million years ago.

Ambulocetus was suitable for life both on land and in the water. Its large feet were more flipping -like than the longer legs of pakicetus, and it used the tail for swimming.

As time went on, the species developed further, and for 40 to 33 million years ago, the fully aquatic Dorudon emerged. Dorudon was a five -meter -long creature with flippers and small hind legs that lived completely in the water and even gave birth to underwater.

In just 10 million years, Cetaceans had completely adapted to aquatic life and marked an extraordinary evolutionary transition. A group of these developing beings, known as Baleen -whales, developed flatter skulls and filtration systems in their mouths, such as those seen in blue whales and humpback whales.

Meanwhile, other whales, including dolphins, orkas and semen whales, retained their teeth.

This fascinating journey from country to sea shows one of the fastest evolutionary transitions in history.