How plants support all life on earth

One of the blacktip reef sharks isn't eating properly, so the staff try to work out why. And, the aquarium's sea lion, Scarlett, graduates from pup kindergarten.

Millions of years ago incredible forces ripped apart the Earth's crust creating seven extraordinary continents. Presented by Sir David Attenborough, we reveal how each distinct continent has shaped the unique animal life found there.

When first constructed it was the northernmost railway line on Earth, and today its locomotives are among the most powerful ever built. But its secret story remains hidden at the bottom of a nearby fjord, where the wrecks of Nazi destroyers and Allied ships lay testament to the crucial role it played in WWII.