Pontius, thanks for correcting my poor reading skills. I agree that avoidance at night or high speed is problematic.
Overall avoidance options are limited and problematic. While in general birds tned to dive away from aircraft, this is not a given. Second, sonce bird encounters are more frequent a low altitude during critical phases of flight when maneuvering ability may be limited and/or constrained by obstacles.
With respect to wildlife control, the key is an integrated approach that uses habitat management (strategic), harassment and predation (tactical) as well as detecting and warning processes. The problem is in our instant society everyone is looking for the "silver bullet" as a solution. Unfortunately, no one solution works and wildlife management is a guerilla warfare activity that requires constant reevaluation of the enemy and changing of tactics.
Radar detection is now a proven technology with lots of development work being done with ex-military doppler radar and sophisticated software to identify bird species and predict route/altitude. Work will need to be done to determine how all the stakeholders; pilots, ATC and airports will use the information, but the future will bring much better tools to detect birds.