As Jetguy mentioned, the USAF
spends quite a bit of money every year for both bird strike repair and prevention. In the USAF
we have a program called BASH, or Bird Avoidance and Strike Hazard. The basis is this, migratory patterns and nesting areas are very closely monitored by ground observers and aviaries, and a model is built. Whenever a bird is hit, the remains are sent to the Smithsonian Institute and identified, and the model is adjusted for that kind of bird. Based on this model and used in conjunction with scare tactics (falconry, decoys, pyrotechnics, etc) a local bash warning is issued which ranges from low-moderate-severe. During the migratory period a mandatory window of 1hr before and after sunset and sunrise is also used. While in this window, takeoff and landing (except emergency, of course) is prohibited. During other periods, based on the report , low, mod, severe, certain types of transitions are prohibited; I.E. during moderate, touch and goes are prohibited, but operational sorties are allowed to depart, but not land, etc. All of this info plays a part in a bigger formula known as ORM, Operational Risk Management, to determine the safety factors for a given flight.
I've had probably 15 bird strikes over the years, all but a few were just small, non-damage strikes. The worst I have had was from a Deer, not a bird. It did $85,000 damage, but that's another story.