There exist plenty of tiny camera drones, except those aren't autonomous. An advantage is that crashes are less prone to damage (less mass => less momentum and

There exist plenty of tiny camera drones, except those aren't autonomous. An advantage is that crashes are less prone to damage (less mass => less momentum and kinetic energy), and if they do get damaged, repairs are [typically] far cheaper. I don't know about battery life, though, and that might be a large disadvantage of those. Also, fitting a GPS unit into one might be tricky.