Every year, gray whales embark on one of nature’s most epic migration journeys. Here’s what we know about it, according to ...

For tens of millions of years, whales have been a part of the oceans. Because of this, it would be easy to believe that whales evolved from aquatic creatures as the oceans warmed and became more ...

Despite their underwater habitat, whales are mammals. Mammals are not solely terrestrial; some, including whales and dolphins, are fully aquatic the University of Michigan Museum of Zoology reports.

The oceans are thought to be where life started but about 50-million years ago, something incredible happened: some mammals found their way back into the water. NOVA is available to stream on pbs.org ...