BAYFIELD, WIS. – Walking atop a frozen stretch of Lake Superior's south shore, Jon Michels paused to look at a 30-foot-tall rippled ice wall cascading over a sandstone cliff cave. Then he noted ...

Canadians may think they're intimately familiar with ice in all its forms, but there is one kind that most have probably ...

Explore the BBC Natural World collection featuring 180 episodes showcasing the wonders of nature and wildlife.