public static void initPredators(int num){
		preds = new predator[num];
		for(int i = 0; i < num; i++){
			predator c = new predator(rand.nextInt(size), rand.nextInt(size));
			c.initRandomness();
			preds[i] = c;
			map[c.x][c.y].setPredator(c);
		}
	}