"In his first 2½ years flying drones at the mine, Mr. Steven said he lost 12 drones to eagle attacks, which cost his employer, South Africa-based Gold Fields Ltd. , some $210,000. During the past year, when he focused his flying in the morning, he has lost two—with two more close calls.
Any successes at deterring wedge-tailed eagle attacks in Australia could provide clues in how to minimize avian obstacles in other regions."
I haven't had any bird interested in my quadcopter yet. Hopefully it won't happen.