What preys on nutria?*

If that is a question you want answered, try Global Biotic Interactions. From the people that brought us the Encyclopedia of Life, GLoBI is an interface that allows the user to access species interaction data collected by biologists and researchers all over the world.  Some pretty cool projects have been done with GloBI, including an interactive ecosystem explorer.

*Nutria, aka Coypu (Myocastor coypus), are preyed on by the American alligator and the grey heron.