German Cockroach
The German Cockroach is a common pest in the house hold. They are brought from over seas by cargo. They are tough to kill because they are able to survive with out its head. It is has a second brain on its rear so when it starts running it does not really know why it is running. It is omnivorous and is capable of surviving in warm to humid climates.  There is a belief that Cockroaches can survive a Nuclear explosion, which is partly true due to there small size and fast reproduction it could withstand a minor explosion but would not survive a full explosion.  The reason Cockroaches enter our houses is because our houses are set to temperatures that mimic there natural enviroment.  They are able to fit in a crack that is smaller than them selves and can be found under fridges, toasters and so on.