S4E6:Ferocious Fighters

8 Mar 201722 minTV-G

Siamese Fighting Fish are so aggressive they will fight its own reflection until it is exhausted. And as David Attenborough finds in this compelling nature documentary, research shows the fighting behavior depends on the personality of the fish. Male kangaroos are solid blocks of muscle with a kick that can kill. Why do these animals fight and what skills must a winner have?