2nd class learning about robotics

Today in robotic class we learned about the different things ways they replaced humans. An example of a replacement is by doing dirty work such as cleaning sewage. etc.. Robots can also play a major role in military supplies. I was watching a video in class and i saw that they invented a robotic bird. If an army is trying to reper other troops, they can send that bird with a camera under it, and since it is very realistic, they would think that it"s just a bird.