public void removeSimpleCreature() {
	synchronized (simpleCreatures) {
	    List<SimpleCreature> sC = Collections
		.synchronizedList(simpleCreatures);

	    for (Iterator<SimpleCreature> it = sC.iterator(); it.hasNext();) {
		SimpleCreature c = it.next();
		if (c.getClass() == SimpleCreature.class) {
		    if (c.isAlive()) {
			c.kill();
			return;
		    }
		}
	    }
	}
    }