I want to agree with you, but I also want to agree with the hypothetical rebuttal GP is making in my mind:

> Yes, they do have engines similar to those found in planes, cars, etc. and so do humans - fuel goes in, chemistry happens, and energy is provided for physical movement in the form of rotation, flapping, or one foot in front of the other.

Idk who I agree with, I suppose it's a fairly pointless exercise in 'how similar constitutes 'similar'' all the way down.