Bird strikes are a problem for aviation, especially large birds. Damage can be expensive, and bird strikes have caused damage to aircraft that results in flight-control issues, a la US Airways Flight 1549.
According to an FAA report, “The annual cost of wildlife strikes to the USA civil aviation industry in 2015 was projected to be a minimum of 69,497 hours of aircraft downtime and $229 million in direct and other monetary losses. Actual losses are likely much higher.”