Specimens:
Specimens are the main antagonists of Killing Floor. While they are widely referred to as zombies they are in fact failed experimental clones created by Horzine Biotech, a biotechnology company in London, England (It is not necessarily wrong to label them as zombies, however, as they behave in such a fashion). There are ten different specimens, including the Patriarch, each with different abilities and appearances. Decapitating them will leave their bodies capable only of simple attacks and walking for a short period, with the exceptions of the Patriarch, Scrake, and Siren, who do not survive decapitation. During wave time specimens spawn randomly at pre-determined locations near to the players, providing there is something obscuring the view between all players and the spawn.