DESCRIPTION: (from Science's press release, April 2012) Sometimes they come at night, sometimes by day. They eat, they kill and they lay waste to the land. They are not from here. They're not even human. Sounds like the plot of an old horror film? In many ways, it is. In a science and wildlife collection, we will look at these fascinating animals in order to understand the causes behind the transformation of these creatures, how they modify their behavior and social organization, leading to their domination of newly colonized territories and endangering native species.