Imagine looking at a majestic blue whale gliding effortlessly through the ocean, the largest animal on Earth. Now, picture ...

Their land-dwelling ancestors lived about 50 million years ago. Meet Pakicetus, a goat-sized, four-legged creature that scientists recognise as one of the first cetaceans (the group of marine animals ...

Pakicetus' descendants continued to adapt, leading to the evolution of Ambulocetus, which lived between 50 and 48 million years ago. Ambulocetus was well-suited for life both on land and in the water.

Once land-dwelling creatures that walked on four legs, these marine mammals evolved from their ancestors, like Pakicetus, which roamed the shores of present-day Pakistan. Pakicetus, a goat-sized ...