@Override
	public boolean canSpawn(World w, int x, int z) {
		int y = w.getHighestBlockYAt(x, z);
		return (w.getBlockAt(x, y, z).getType() == Material.SAND
				|| w.getBlockAt(x, y, z).getType() == Material.GRAVEL
				|| w.getBlockAt(x, y, z).getType() == Material.GRASS
				|| w.getBlockAt(x, y, z).getType() == Material.STONE)
				&& w.getBlockAt(x,y+1,z).getType() == Material.AIR
				&& w.getBlockAt(x,y+2,z).getType() == Material.AIR;
	}