Bit of incorrect science/misinformation above comparing birds with drones (including model aircraft for sale of argument).
On impact with something at high speed the bird's body essentially behaves as a fluid, dissapating energy and without hard points of impact which can penetrate or shatter hardened structures.
A drone is basically some heavy lumps of metal (motors and batteries) held together by light plastic frame. On impact it's the metal bits that do the damage. They don't disintegrate. Vs leading edges, radomes at high speeds the drone will likely penetrate. Vs helicopter rotors it will likely break the blade of even a decent size one, likely causing a fatal accident.
CAT aeroplane windscreens are pretty well protected at below 250kts.
Source: UK govt study of mid air risks from drones.