(The Conquerors/2012) Sometimes they come at night. Sometimes by day. They eat, they kill, they lay waste to the land. They are not from here and aren't even human. Sounds like the plot of a an old horror film? In some ways it is! Who are these invaders? We take a look at some fascinating animals, in order to understand their transformation. How have they modified their behaviour and social organization, leading to their domination of new colonized territories and the endangering of endemic species.