Yes, it must be very difficult to walk on stilts with such an enormous costume. And then bowing and turning so quickly too. It seems humanly impossible, but the result looks very natural.
Where I went they also had actors with firework torches to "keep the birds under control". And those sound effects are so creepy and realistic, and that "trainer" plays his role so well. (I saw a woman do that in a somewhat different style, but she was amazing at it too.) All the details of the entire act are absolutely perfect.
It was indeed incredibly impressive, but also hilarious with how they try to eat anything and anyone in their way. I saw them live in the middle of a city and they tried to steal food from people's plates on a terrace too. xD