Grand Prismatic Spring: what makes it so colourful?
What lends this geothermal site in Yellowstone National Park its rainbow-like appearance?
What lends this geothermal site in Yellowstone National Park its rainbow-like appearance?
Can these quill-loaded creatures really float, or is it just a well-propagated myth?
Discover what terrain provides the setting for some of the world’s most turbulent water
Discover how these skilful dive-bombers swoop down and seize their lunch in style