This time it's Kouji's smile. The point is that the hind legs are raised! You can't help but smile when you see her walking smoothly with her inner thighs. However, when running, it can reach speeds of 40 to 50 km/h. Being able to run at such speeds with such size means that he has amazing power.
You can smile because you can observe it safely here. If I were to encounter one in the mountains... it would be terrifying just thinking about it.