This week we take a dip in the Amazon to meet the red-bellied piranha. We ask if its blood thirsty reputation is really justified or is there a softer side to this toothy fish? In the news we look at a new fossil species of bird relative and what it means for their evolution. All this and more....

This week we meet the sabre-toothed sparassodont, Thylacosmilus, and take a look at the unusual adaptations of this superb sabretooth. In the news, we see that humans and octopuses are more alike in our thinking that you might assume. All this and more. The cupboard is open, come on in!