You are fortunate it was low enough to retrieve. One of my sons has been storing one of his drones about 200 ft up in a tree for the last few years. The return to home altitude was not set high enough to clear the trees.
None. I attribute that to a mixture of the bird's caution and my evasive tactics.
Clearly you could speculate that the birds were just trying to scare the drone away, and would not have actually hit it if I'd just ignored them. But that's not a...
Two part answer:((USA)
1. Under Part 107 (USA) you must have remote ID, and register w/ FAAif you are flying commercially, regardless of drone weight.
2. Under Section 44809 (recreational flying), as long as the drone is under .55 lbs. (250...