Bears with four legs ... Borradaile famously defined as "the many attempts of Nature to evolve a crab.” Let’s go to the Thought Bubble. It all started with the cycloids, a group of arthropods ...

Just five stars are left in the competition - Dressed Crab, Wolf, Bear, Bush and Pufferfish - and after tonight's show (Saturday, February 8) we will have our final three vying for the win.