It really depends on the application. If you're talking about flight, and autonomous-flight at that, keep in mind that airspace is highly regulated. (In the US) The FAA requires RC pilots to be licensed (inexpensive and no test, but still necessary) and RC flight must always be in line-of-sight -- usually in very specific, designated areas. It's quite easy enough to build an autonomous bird, with programmable way-points and such, which breaks all sorts of laws. Start with the AMA: http://www.modelaircraft.org/
There's a lot of specific distinctions between piloted-flight versus autonomous ('drone') as well as size restrictions and such. First-person view (FPV) requires a second pilot using grounded line-of-sight, as well (http://www.modelaircraft.org/files/550.pdf).
I'm by no means trying to discourage you, just know if something might be a federal offense!
There's a lot of specific distinctions between piloted-flight versus autonomous ('drone') as well as size restrictions and such. First-person view (FPV) requires a second pilot using grounded line-of-sight, as well (http://www.modelaircraft.org/files/550.pdf).
I'm by no means trying to discourage you, just know if something might be a federal offense!