Broadcast Outage: We're investigating a broadcast transmission failure affecting the San Luis Valley from Antonito in the south to Salida in the north. We're working to resolve this issue. You can stream our live broadcast HERE or via the RMPBS+ App.

Stream live and on-demand content now on our new app:
RMPBS+

Help tell more stories in 2026 - make a year-end gift!

Give Now
NOVA show's poster
Science and Nature
TV-PG
2022
NOVA

When Whales Could Walk

NOVA brings you stories from the frontlines of science and engineering, answering the big questions of today and tomorrow, from how our ancestors lived, to whether parallel universes exist, to how technology will transform our lives. Visit the official website to watch full-length documentaries, or explore our world through short-form video, on our digital publication NOVA Next.

When Whales Could Walk

Season 51 Episode 1 | 53m 31s | CC

A spectacular fossil graveyard reveals a 43-million-year-old whale that had four legs and could walk. Follow scientists as they search for new clues to how mammals moved from land into the sea to become the largest animals on Earth.

NOVA

Watch more episodes

See more
See more
Original production funding for “When Whales Could Walk” is provided by the Canada Media Fund.

Subscribe to Our Newsletters

Get trusted Colorado stories, programs, and events from Rocky Mountain PBS straight to your inbox.

Set Your Preferences >