Sounds like planes can usually survive one bird without a problem. The engine is designed to shutdown anyway (whether it breaks or not, doesn't matter) so as long as there isn't a big flock to clog up multiple engines you'd be fine.

From Wikipedia: "High speed impacts, as with jet aircraft, can cause considerable damage and even catastrophic failure to the vehicle. However, according to the FAA only 15% of strikes (ICAO 11%) actually result in damage to the aircraft. The impact of a 5 kg (12 pound) bird at 240 km/h (150 mph) equals that of a 1/2 ton (1000 pound) weight dropped from a height of 3 meters (10 ft).

Bird strikes can damage vehicle components, or injure passengers. Flocks of birds are especially dangerous, and can lead to multiple strikes, and damage. Depending on the damage, aircraft at low altitudes or during take off and landing often cannot recover in time, and thus crash."

"Most large commercial jet engines include design features that ensure they can shut-down after "ingesting" a bird weighing up to 1.8 kg (4 lb). The engine does not have to survive the ingestion, just be safely shut down. This is a 'stand alone' requirement, i.e., the engine must pass the test, not the aircraft. Multiple strikes on twin engine jet aircraft are very serious events, they can disable multiple aircraft systems, requiring emergency action to land the aircraft.

Modern jet aircraft structures must be able to withstand one four pound bird collision; the empennage (tail) must withstand one 8 pound bird collision. Cockpit windows on jet aircraft must be able to withstand one 4-pound-bird collision without yielding or spalling."
Source(s):
http://en.wikipedia.org/wiki/Bird_strike

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